Im playing it stock right now. Great racquet..awesome feel. I think this thing feels better than a babolat tweener by far. The control is better, and it is easier to keep the ball in consistently.
While it is very light compared to my 6.1s, I have not modded it yet. I think the beauty of the racquet is that it hits a pretty big ball at such a light weight. Anyway, I will tinker with that over time and figure it out.
This is a very slept on stick. I'd put it in PK 7G territory almost.