That is a cute little machine, but it scares me. In my day job we have a room full of laser engravers, mostly in the 100W range and up, mostly with much larger tables, and all in the $30,000 plus price range. A pretty savvy manufacturing engineer (not me) spent a lot of time researching and negoiating to get good equipment at this price. If all you want to do is burn the paint off trophy plate painted metal stock, this would probably get the job done, slowly. Even if this machine turns out to be operational problem and breakdown free, I'd be suprised to see it cutting away depth and width of hard wood.
I've seen big lasers operating at equipment shows and gift shows that are located in major convention centers. It may not be welcome in a church basement or school cafeteria, but the fumes aren't all that bad, certainly not for an outside show.
I've lasered a lot on tubes without utilizing the rotation function. On tubes as small at the upper barrel of a Euro you can do it flat, it will just be slightly deeper in the middle than at top and bottom, but you have to have enough power to carve it deep in the middle. A laser that will only etch the surface unless you let it run at full power and tortise speed, won't get the job done very well. Lasers are tricky to transport without damaging the tube.
