They've got one at the school I went to which has an 80W laser, pretty sure it's this one:

http://www.ebay.co.uk/itm/Profession...item25571ce1c0

I gather there were some problems with alignment, but nothing too difficult to put right. They mainly use it with acrylic and the edges it cuts are never square. Also after a couple of weeks the laser seemed to loose a bit of power, but it's been stable after then. Not sure if that's normal. So far as I know those are the only issues with it, but I'll check next time I'm in.

They sold the biggest lathe, a bridgeport and surface grinder to get it... I know which I'd have preferred.