My bottle is the second incarnation, i've had it well over a year, though it does seem the bottle design has changed again recently, so basically i'm not sure, only to say it feels exactly the same as the original.
As for muscle, a lot of it is in the thumbs as you'll know, and both mine are weak as hell, especially my left one as last time i broke it i didn't even rest it, as i didn't want to miss out on bouldering trips with the mates. 
Btw, i could easily beat 42 seconds if i really tried.
Include a little history in your walks. Pecsaetan - Ancient Derbyshire, Staffordshire and South Yorkshire - http://pecsaetan.weebly.com/