We went on this yesterday (top down).
The grade seems a little on the generous side on the final pitch, it certainly felt easier than the first pitch of supermassive.
I have to say that despite all the bolts, Twll Mawr felt very intimidating. Mr Panton suggested a helmet was essential on a weekend and he was proved right as people started hurling things down into the hole, lovely.
The climbing was great and its nice for a wuss like me to be able to climb in that part of the quarry.
(ps. can anyone explain why the hell there are bags with animal bones in at the bottom of the route?)