Quad Bike for my boys.

[Nostalgia]

Hi all, Recent events at work have taken their toll on my family. My wife and i understand whats going on but i feel real bad for my boys. I would like to get them a Quad Bike. I was actually gonna get myself a project car but thought No stuff it, my boys deserve a new toy more than i do. So im looking at 49cc 2 stroke but would really prefer 90cc or 110cc 4 stroke. Does anyone on here have one. Im looking for info on reliability etc etc. Thanks in advance.