I looked into them myself a few months ago, seems the quality is all over the place. I did not even consider the cheap plastic ones for $40.00. Was looking at some metal handguns for around $150.00 but decided not to go there as the slide hits the hammer when it comes back on the 1911's and on real guns this takes a beating, with these potmetal versions I felt they would wear out quickly.
There was a Glock version that I was thinking about, I own 3 original Glocks, so did not want more of the same thing. Makes you think about how represive it is in other countries where the only choice is to buy air soft and not an actual gun.