In reply to Wide_Mouth_Frog:
Put about a year of 1-2 sessions a week indoor and out on my Beal Karma and have recently replaced it with a 9.8 crag classic so I might be able to offer a bit of a comparison. Disclaimer: I haven't used tonnes of different/expensive ropes to compare with.
Yes, I found it got twisted a lot, but not significantly more than the Mammut. (lots of routes near me involve lowering over edges etc...)
I found it handled pretty well, I prefer the Mammut but again, not much in it.
I almost brought the Karma again but in the end the Mammut was on sale for a comparable price (worth checking their website).