ive been using an ATC guide slightly out of spec (rated to 8.1, used on oplux), and it works OK but i had one descent with a wet rope that was still safe, but harder to slow myself than i'd like, so was VERY happy to see grivel master monos back in stock at EWO (i saw a bunch of stuff towards the end of last season that they'd been discontinued, and the EWO site still has this disclaimer up, but got some stock back in for now at least). Perhaps it won't be THAT different, but glad to be using something within spec this year. that and an autoblock and i'm all good for the descent. i use a CT rollnlock on the way up.