I got my Impact back in August but I wanted to run it for a while before giving my feedback.
Put in in a MPA and bolted on a Diamond, no fitment problems at all. I threaded on a Stuteville prefit and it is easily as accurate as any other gun I have had.
I have ran it at multiple club matches and 2 national level matches with zero hiccups. I did however round the profile of the ejector plunger to cure a minor feeding problem when using the Magpul Pmags.
I switched to the Impact from an AIAX and I can say that I like the Impact better. The bolt lift and close is easier and it will run basically dry without lube, which in my opinion is huge for shooting dusty matches. When shooting in dusty conditions the Impact feels the same at the beginning of the day and the end.....really smooth.
To make it the perfect action I would like to see a AW mag cut, and a quick change barrel system like an AX, and maybe interchangeable bolt heads.