Surface Blanks.

These are by no means going to be my daily all mountain ski. I have a front side ripper, and something fat for the soft stuff. I also had a pair of park skis, but someone made an offer on them that I couldn't pass up. Now I need to find something to fill the twin tip void in my life. So I happened to stumble onto the surface blanks. They're cheap! like really cheap, but usually you get what you pay for. has anyone actually put these things through their paces? How do they ride?