Anyone who says that the MC 9.5 is crap just doesn't know what they are talking about. Not saying it's not possible, but I have never seen a broken one and I've never met an owner who did not like their frame.
I have only ridden a V10 a few times, so I cannot comment much on them other than they are great frames.
I own a 9.5, though. Simply, it's an awesome frame. Mine has taken a bunch of abuse and not complained. It jumps, pedals and takes hits well. It's a good all-around DH ride. I've had good results on it and I don't think it holds me back. I swapped out the 5th for a Push tuned Fox RC and it rides better. Also, the shock I'm running is an 8.75x2.75, so the bike is considerably lower and slacker (~14" BB and mid-low 60s HA). Gotta watch the pedals and rings a bit more, but it's quite a bit more stable. I mostly switched the shock out because I didn't like the damping on the 5th and I had a spare Fox in that size.
My only complaints about the bike: it's hard to reach shock adjustments because of the suspensio design. I had to take bolts out to get to the pressure valve on the 5th. Also, the suspension has a lot of bearings, which can get expensive. Never had a problem with durability, though.
I have only ridden a V10 a few times, so I cannot comment much on them other than they are great frames.
I own a 9.5, though. Simply, it's an awesome frame. Mine has taken a bunch of abuse and not complained. It jumps, pedals and takes hits well. It's a good all-around DH ride. I've had good results on it and I don't think it holds me back. I swapped out the 5th for a Push tuned Fox RC and it rides better. Also, the shock I'm running is an 8.75x2.75, so the bike is considerably lower and slacker (~14" BB and mid-low 60s HA). Gotta watch the pedals and rings a bit more, but it's quite a bit more stable. I mostly switched the shock out because I didn't like the damping on the 5th and I had a spare Fox in that size.
My only complaints about the bike: it's hard to reach shock adjustments because of the suspensio design. I had to take bolts out to get to the pressure valve on the 5th. Also, the suspension has a lot of bearings, which can get expensive. Never had a problem with durability, though.