In reply to boywonder: I climbed on a pair of Beal Jokers when we were in Riglos. We were climbing as a team of three and no-one particulary wanted to second on a single 8mm line.
Used as a pair of halves for leading they are pretty heavy,noticably much more weighty and draggy than a lighter half rope setup on the longer pitches (over 30m). While I love them as a sport single and for their versatility I wouldn't rush back to using a pair of them again, just too heavy for me (but then I'm small and fairly weedy). For dedicated half ropes,I'd go just a bit thinner - something like a cobra should really be sturdy anough for most things.