Frans, anything can tear up a yard, a little practice with a skid and you don't tear up the yard. Learn to turn in an arc rather than making the turn now. Use both sides to gently create the turn radius, it can be learned rather quickly.
If it's muddy or realy wet, it doesn't matter what you use.
I like tracks, they don't tear up the ground as much as other make it out. Again, knowing how to gently turn the machine and all you do is tear the grass up a little.
No, I cannot lift 400#'s, that is why I bought my mini! I just thought it looke like a bigger machine and generally the articulates lift more. That is all I was saying.
It seems like a neat idea in a compact machine. I just think it will becost prohibitive when you price out attachments.