For the money, they're great little markers. You won't get any frills, but they do what they say on the tin. I've never had a problem with my '08, but it's not unheard of for some problems to arise with the SLG range.
real easy to strip down and re build. i love mine.
only real problem i get is when there is too much lube on the sear catch and the bolt wont catch causing mechanical full auto.
easy fix .... strip down and de lube the catch... then carry on playing.
the best thing is. you pay your 200£ then walk right onto a tournament field.