My wife and I are both using viking x-tremes and have been very happy with them. They've proven tough and durable over the 100 odd dives since we purchased them. There are few seams (this is important to someone who had an oceanic flex with lots of --leaking-- seams). The valves have given me the high quality performance I expected. The intake valve is very quiet, so I had a period of acclimatization after the noisy intake of the oceanic. And it stood up to the below freezing temps this weekend. Good suit. I'd buy one again.
Oh, I know a fellow in Alpena who does some commercial work. He also has an xtreme. I questioned him pretty closely before I bought mine. He was, and remains, very satisfied.
Hope this helps,