In reply to AlexBush:
> I use a click-up [...] but started to get annoyed with it locking while paying rope out too quickly (I know people who also have this issue with the gri-gri)
You are spot on. That's exactly where problems begin with MOST assisted braking devices.
People will try anything to prevent unwanted locking from happening. With the GriGri (v.1 and v.2) and the Cinch (I can only speak for these two devices) there are popular improper ways to by-pass the locking mechanism and effectively belay unsafely.
With the Cinch you can pay out slack in two different ways (see manufacturer's videos) and as far as paying out slack, the Cinch is possibly the best device in this category. There is no need to change belay method while belaying; very easy. And yet, I've seen way too many people holding the Cinch with one hand perfectly in-line with the climber, braking end of the rope running free through the device etc.
With the GriGri... one has only got to appreciate the effort Petzl is making trying to persuade people to use it correctly. The latest (funny) video (feat. Nina Caprez) is the most effective imho. Brilliant device... if only people knew how to use it. I've seen more than one climber hitting the deck not even climbing... being lowered off! Let's not forget that unless we witness such accidents in person we will only ever know about them if they're fatal
The Click Up... I still have to figure out how to grossly misuse it without realising it or how to totally by-pass the locking mechanism, given that, differently from the others, not keeping a hand on the braking end of the rope "feels" unsafe even when correctly used. If you don't feed the rope into the device it will easily lock. True. More so with stiffer ropes. "Unexpected locking" and "rope twisting", are the two major arguments I hear against the Click Up. Both have a solution, however impractical or annoying, I don't think they're show stoppers.
Finally, I still think a good trustworthy belayer (possibly wearing belay glasses) and a tube are hard to beat
Nic