I own a pair of SuperMountains in a 186cm. I've had them for a couple years. They have held up well even after a few encounters with Montana shale.
I'm 5' 11", 175 to 180 pounds depending on how close it is to Xmas. I have other skis so my SuperMountains are mainly for powder, crud, crud turning to moguls, soft moguls.... I use other skis for packed and icy conditions though I could get by in Montana with the SuperMountain as my only ski.
I have been very happy with this ski. They were wider than the normal mid-fats (until this year) but not quite as wide as some of the fats. Their width makes them great for most powder conditions except classic Rocky Mountain cold smoke. When the snow is super light I wish I had something even wider. They are not a very lively ski which actually is a benefit in crud where they shine. If you are looking for a ski with some zing at the end of a turn look elsewhere.
I have found the SuperMountain to be fun on groomers but overmatched on ice. I like them in big moguls where their width and lightness makes them easy to push around. They are torturous in small, tight moguls, though.
The SuperMountain is out of production so you can get some great deals on them. They are well worth the $300 or less price I've seen on them.