I bought a 2nd gen Mini from here 5/6 months ago and i love it! We play 2/3 times a month and i've never had any problems with it. My mates have all moved on to ETEKs and PMRs but after trying them i still prefer the Mini (until i can afford an Ego anyway
). It's light, accurate and reliable.
The guys are right though, if you're not going to buy brand new, you really should try before you buy, i was lucky enough to buy mine from someone that took great care of his markers.
Overall i would definately recommend the Mini, you won't be disappointed