@Bwood34 : I got the 2.8W version. My rationale was:
- it’s still somewhat affordable (the 4W and 7W were above my psychological price limit)
- I was going to doing surface engraving only. Let’s be honest, if one wants to CUT things with a laser, one is better off buying a standalone 40W laser.
- the native resolution seems to be optimal at 2.8W (higher power ones need a lens)
I’m quite happy with it, some people will say it’s crazy to spend north of 400$ for a laser module that is essentially less than 100$ of components, but I for one didn’t want to take any chances with a) my eyes and b) my house (I would hate to have “a chinesium laser module set his house on fire” as my epitaph), and what sold me on this model was the shroud (with magnetic mount, it snaps on and off in a second) and mostly the triple safety interlocks (on/off button + turnkey + external trigger that I wired to a switch on the outside of my enclosure). Anyway, this will sound like I work for JTech, but I just appreciate decent engineering.
@fenrus :interesting, this model did not exist (or I did not see it) when I bought one. But the big question is, what’s its max rated RPM ? 
@RoughDraft40: this time around it really WAS the other way around, and to tell you the full story, I found myself stuck with my previous fixed-Z-height laser mount. I felt really dumb not having anticipated that one day I would need to move the laser along Z…Hence the spindle-attached 3D-printed thing. Which could have turned into another smack-my-forehead moment, when I realized that of course I could not home the machine with it in place. Since I made it a snap-on thing, I dodged that bullet. Also, do give in to that Prusa attraction, it’s a great tool to have (and even you don’t, read about the story and continuous improvement approach of Prusa, it’s inspiring)