In reply to GridNorth:
For me there are several different qualities that come into question, how:
• a fall is arrested; soft catch versus shock
• easy a belayer can pay out/give slack, for the novice and the all knowledgeable
• difficult or how easy I (of course “one”) can make a mistake with the device, think of not good getting the rope correct into the device (example: for myself I still remember lowering of –abseiling– with a double rope with a Reverso and clipping only one strand in the crab (late at night in hurry))
• forgiving the device is if you make a mistake – not paying attention on the climber –burning sun, etc– but still catching a fall if … ; an other aspect: if the device blocks and you have to pay out fast (thumb on GriGri, Alpine up click back) how easy is that done, etc
• easy to get a intuitive feel for the device (as an example: a Mega Jul and I, didn’t match, pfffh a terrible one night stand and never again)
• the learning curve, how self explaining is the device? I had to study the Click a little and never the GriGri one and two as far as I remember.
• much tangling of the rope comes from the device (I have experienced it with the Alpine up that if I don’t guide the ropes it becomes a mess). There seems to come a new Click up next year which may behaves better.
And take in account some of these points in relationship what kind of route is climbed. Bolts and/or pitons plus some nuts or all own placed gear. Is it one moulinette pitch or is it multi pitch. Can I see the climber? Taking rests, how well does it block.
I like the GriGri in the climbing room. Easy to check if the rope is correct in the device. You can climb with anyone.
But outdoors I prefer being belayed by an experienced climber and I like belaying with a Click.