This was (and at the time is the only) my first 6x6 and I must say, I had high hopes, most of which it did live up to.
Only problem for me is I can't seem to find a tension in between too heavy to rotate and so loose it locks up or pops. If I want the inner layers loose enough to be easy to rotate with fingertricks the outer layers lock up and/or pop way too often, if I want the outer layers perfect the inner layers get so tight they become cumbersome.
Other than problems tensioning there really isn't anything wrong with it from my point of view. If you don't have a 6x6 this is a great first one if you can afford it. If you can take the time to find the perfect tension for you that is. I'm still working on that, but I know it's there... Somewhere.