I've tried Titan. Not a bad site. Lots of loose play; their short-handed tables usually have more action then full tables which I like. They have a pretty good bonus program - don't have any codes on me but they are out there.
I just joined Noble a couple weeks ago. I guess the bonuses are impossible to clear, the software is resource intense, the traffic isn't as good as some other sites. Otherwise, they might be worth trying if you've already hammered through the PokerRoomReview top ten. I haven't played too much, but nothing has impressed me or anything yet.
I play there thru sportsinteraction, limit game traffic is ok, the others can be slow at times.....tounrnys are not very big, usually $ 750, 1000 and 1250 with a 25,000 on sunday that is fairly easy to place in.....im always pd within 36 hrs..