HI Greg - I have the Benbox machine which (I believe) is the same unit. I was told the 5500mw laser does not put our a dot beam and in fact the beam is about 2/3mm wide...so its not good for engraving or precision cutting for that matter. As a result of being told that by the factory, I opted for the 2500mw laser diode. My machine is all assembled but I am still waiting for the laser head to arrive.
I found support lacking from the factory, but there is now a new community-based support site for these lasers here: Benbox Laser DIY Machines - Index