Line masterminds are designed to be soft,light and cheap, and they are soft light and cheap. However from what I have heard they are an example of light/cheap/durable, pick two. If you're looking for an all mountain ski from line I would look at the chronics. The chronics have a stiffer, snappier flex, I really like the flex on the chronics it works well on small jibs and larger features too. Don't be put off by the term stiff flex, they are still realtively soft in the general scheme of things, and I at 6'0" 175lbs could butter them with little issues. Next season's chronics feature tip and tail rocker this will allow butter to come easier and reduce the swing weight. If you want a soft flexing truly symetrical park ski from line look at the travelling circus ski, it's the old anthem, which is a legendary park ski.
Hope this helps, Joey