Answering your cycling questions

Definitely not easy to remove and replace. Quite fiddly to set at the right height as the rubber stops them turning unless the clip is fully loosened (this is of course a good feature once you have them set up). I would choose a different model if you want to conveniently remove them every day.

It easy to take off the battery. But not the lights.

Not really quick, need to unscrew the clamp and take off, but it is a finger wheel so quite simple.
Only takes about a minute to do, and perhaps a little longer to put them back on. A clip system might be quicker, but may also wear down and become less secure as the current set up in time.

However, I guess it would become a bit tedious every day!!

Very easy. 1 finger screw per light and a velcro strap for the battery

Easy peasy. Just unscrew and unclip. Can even do it with my gloves on. Battery is a bit bulky but have often used mine for commuting and they have been great.

A little bit fiddly as each light needs to be unclipped and the cable which needs to be held by straps has to be unstrapped but the battery is quick as it is held by a wide velcro strap

All you need is just your fingers. I say it takes few secounds.

I have it on my race bike handle bars.

It has 2 sized rubber clamps, and my bars are quite fat at the point I have them.
No probs fitting , and remain very secure

Yes

yes they easily fit on oversize bars.

Yes these will indeed.

Yes, they will fit.

When riding in unlit areas, the two lights provide a better sense of the depth of potholes, ruts etc, probably because long shadows are removed by dual illumination.

I like having two as I turn one off when I don't need it, for example when the road is lit or just straight . I can also turn one light off and one onto low beam, so people can see me but saving battery power.

However, a single bright (350+ lumen) light will enable you to see further, so I have on eon my helmet.

The Terra 2 really only lights up the track in fornt of you, although it does that really well.

Yes twin is better than single bulb

Personal choice but with twins like this you can have 1 set to wide angle and the other as a spot further out. Plus vary the strength so one is high the other flashing. Two gives you choice

Yes, because these lights have a wide beam and focused beam which means you get a concentrated view and an over all view of the trail and minimises shadows. You can also point each light in differant directions/ slightly crossed so you get a view of the trail while going around corners

The answer is it depends. But if you are considering buying these then do so. I have had mine about three months. Used them on and off road and they are great...!!

Full beam is plenty powerfull to light up all the road and verge giving you good visibility for pot holes. IF not enough you need to spend lots more money in my opinion

Very. Love mine.

120 lumens per unit is pretty good for this price. It is very powerfull for this price.

The battery full runs for 35 hrs on flashing mode, 5 hrs constant mode. It tells you when it get's down to 20% left.

This product is very good and brightness is very powerful especially with the twin light

In my experience, yes it needs charged. The battery has some charge, possibly for testing or storage purposes, but the red light came on with mine within an hour of using on full beam.

Mine worked OK for several hours before it needed chargin the first time.

The box says to wait until the red light comes on before you charge it.

I would drain then fully charge. They wont be fully charged when you receive them

I would charge it. It does have some charge but only a little.

I took the advice off the box which said do not charge until the red light comes on. Used the lights on full for a total of 90 mins and still not lit red requiring charging.
Hope this helps

The battery is about the size of an old style big mobile phone and can be mounted lots of places on the bike. It is fixed on by a very secure velcro strap and have used it off road with no problems (though it did get filthy). Really easy to fit and use. Would recommend it.

the strap is the size of a regular cateye mount.

The power pack is the size of a toilet tube roll, fits in place with a Velcro strap. Brilliant lights.

It does come with velcro staps to fix the battery to the bike. The cable is about 60cm long or more.

The two lights have an 8 inch lead from each which join to a single wire that then travel to the battery pack connection. This wire is quite long and will easily reach a bag under your saddle.
Unfortunately no Velcro straps are supplied to stop the cable flapping about, but these are easily attained so not a major problem.

I haven't measured them but they are long enough to fit the battery behind your seat if you need. One single think velcro strap for the battery pack, nothing for the cable but I simply tucked the cable in with the battery pack as I attached the pack on the frame by the front fork

I ride along a very bumpy track on my commute and have not experienced any flickering from these lights.

Haven't encountered

Only if the cable leading to the battery pack is damaged at the point where is joins the battery. I had that problem with the single front version of this light but Evans got me a replacement and I haven't had that problem since then.

Both lights are hard wired together however they can be switched on independently, wouldn't really use as a torch though as there are many items out there that would be better used as a torch.

There is only one connection between the battery and the lights and the leads for the lights are joined into one connector, so they cannot be connected separately.

Nope, both lights meet in a Y-piece which then goes to a connector to the battery

They have removable rubber shims to fit multiple size bars. My bars are 31 mm and they perfectly fit by removing one set of shims.

They come with 2 rubber sleeves which you can remove. Should fit the larger diameter handle bars no problem.

The brackets should fit any size bar. The brackets come with some rubber inserts to get the right fit. If these are too big / small just chop up some strips of old inner tube and add as many or few strips as you need to get a snug fit. This trick works for any clamp style bracket, so it's always worth keeping a bit of old inner tube in your tool-box for this purpose.