Well, accuracy is a point that will always be up for debate.
What I can tell you about the matrix, is this. It doesn't have the looks of the Angel, it doesn't have the (unnecessarry) gadgets of the Angel, but it also doesn't have the price tag of the Angel. (allthough the soon to be released Pro Matrix will have a lot of these features).
As far as the shooting is concerned, the Matrix is a dream. It's really easy to shoot fast, and it's dead quiet. The trigger seems to be a bit more springy than the Angel one, and it has a noticeable click, which some people hate, and some people love. I love it (I shoot an Angel by the way).
About the gas effeciency, this has been largely remedied in the later series, although it still ain't the most efficient marker out there. Good thing is that you can also run it on Co2, meaning you don't have to fork out the cash for a marker AND an air system when first starting out on electroes.
All in all, the Matrix is a damn fine marker, and I think you'd be happy shooting one.
Peace!