Aftermath products are cheap, they have a high failure rate (50%+ in some cases), and can be a bitch to find fitting aftermarket parts for.
Chances are you'll end up spending what you payed for the gun within a year of owning it on parts.
The bodies are crap, the accuracy is crap, shimming is meh... almost everything about them is meh.
You get what you pay for. Decide for your self if you want a cheap "meh" gun that might fail on you, or if you want to spend more money on something proven to be more reliable and better performing. Your choice, we can't make it for you.
Oh, and to all the "once you upgrade them they're good" fanboyz... guess what, once you replace all the internals, it's no longer an aftermath, is it?
"Someone in a Prius tried to race me at a stop sign the other day. I couldn't believe it. I had him for the first 100 feet or so but I can only walk so fast."