I have a GN Evo 5 star and its a decent bat. I have been knocking it in over 4/5 months lekin it still hasnt really started performing to its full potential. I'll using this bat in the nets for nxt few weeks and it will improve quickly when I use it more in nets against real bowling and throwdowns. I think it will turn out to be a good bat in the end. I have used few shortcuts when knocking in otherwise it would have taken a full season of use for the bat to open up.
GN evo is 2.9 and pick up is good but not as great as GM and GM is 3 or 4 ounces heavier but it feels lighter then Evo and has much better balance overall.
My Evo bat has very little concaving but I have seen other evo bats in shops which have had more concaving. The 2011 evo bats I have seen have better balance and much improved pick up.
The finishing on the bat is good but there was bit of room for improvement on some parts of the bat and I sanded the bat around the side edges and this has improved the balance, control, feels much better and it picks up lighter. I also added another grip which has improved the pick up/balance.
Feel free to ask any question(s) if u have any