I bought a 10' Xstream about a year ago after owning a Buck's Bags Southfork and shopping around for a long time. I really like the Xstream. It's very stable, I have no problem standing on it while on anchor or on the move. The first time out I was surprised how stable it is when I anchor and stand to fish. I haven't done any heavy water but have had no issues on the Skagit, Sky, or Stilly with it. The one drawback is that at around 100lbs it's too heavy for one person to lift/carry. With one person at each end it can be carried. It also will not fit into the bed of a compact pickup when inflated and put together.
Stonefisher, if you send me your email address I'll share what I learned while shopping around.