None. Don't even read the rest of the review. go buy one!
The Angel A1 Fly is amazing, especially for the price of 895 (comes with a barrel kit and a phenomenal board) . Right out of the box I gassed it up (with a low pressure tank) and was test firing it. The Sly barrel kit it comes with does a fantastic job. The line of paint is 100% consistent with the stock barrel (the balls are breaking one on top of the other with less then an inch variation)
I took the gun to my local field and at chronographed today. 284, 286, 284. The Angel was shooting a perfect line of paint end to end.
The board has more features then any other stock board, and after a bit of reading is very easy to use.
The low impact bolt truly does not break paint. I shot 600 rounds of old dented paint and didn't break even one.
No gun, in my opinion, has nearly the features and performance of the A1 Fly for the same price.
Go to your local field and try one, you won't be disappointed. If you live in Michigan visit Cru Paintball. They have amazing service and sell the A1 Fly!!!