SRC can be broken down this way (IMO):
Generation 1: Do not touch these. Period. Ever. Not even if you are paid to.
Generation 2: Hit and miss. Some (such as myself) got VERY good, reliable guns. Others did not.
Generation 3+: These are finally respectable products. I was very happy with my Generation 3. It shot quite nice, and the rate of fire was actually noticeably faster than some of my other stock guns. I would definitely consider another Gen 3 SRC if I was in the market for a stock AEG.