I have one of their m1600s that I got when I was a kid. Gun shoots well but its not a high quality firearm and parts are a bit hard to come by. The only issue I have had with mine is the firing pin cracked so it took awhile to find another.

I have 15-20,000 rounds through mine and still take it out from time to time. I have seen some in the last few years that looked to be a bit better quality...

Assuming you got it fairly cheap it should be fun and last awhile...