I'm all about the china knock-offs now. To get off topic a bit, I bought the S-system rip for 130 bucks, and I am more than impressed. If it didn't say A&K on the reciever I wouldnt be able to tell the difference. I have an extra TM lower and a V2 gearbox to stick in, so it was well worth the money. I'm going to leave it as it is for awhile to see how it performs, if it does ok I'm going to start buying up the other cheap crap. Here is a good place to see the "good" knock-off stuff.
http://www.gunnerairsoft.com/indexeng.htm
http://www.gunnerairsoft.com/indexeng.htm