NEVER BUY A EBAY LASER!
As some one who gets to see a lot of lasers I have seen a lot of the Hk, or no name lasers and they are getting worse! Always get a name brand laser and spend the extra. When they build a no name laser cutter they will use the cheapest parts. A lot of the newest ones are using parts from the k40. If you know anything about laser cutters you will know the k40 is a low quality laser cutter. It uses finishing nails to hold the mirrors on! The no name lasers are built to last 30 days so they get past the Ebay promise.