With almost no rocker, it won't turn quickly enough for anything more than an easy Class II -- remember, this is a cruiser. (I'm a Class III boater, but there are different boats for that.) It has plenty of tumblehome for efficient stroke mechanics, and sufficient volume for camp-cruising up to a week or so. It does weathercock some, so crossing large lakes in high wind can require a lot of effort. But it's very dry in waves and chop, with enormous primary and good secondary stability.
In the all-Kevlar layup, it is wonderfully light and easy to carry on one shoulder, but it's not made for rock bashing.
The Solitude was never a popular boat (Wenonah sold a lot more Prisms) and hasn't been made in many years, so if it suits your style of paddling and you find one in good condition, don't hesitate!
Would I buy the boat again? I did.