take a look at the engravers forum on Sawmillcreek.org
The main thing you'll find is post after post after post of "I have this problem with my XYZ laser", "How do I fix this?", etc message on mostly Chinese models including the full spectrum.
The one I notice that doesn't get any problem questions is the Universal Laser System (ULS). And for the most part Epilog doesn't have too many problems. The main thing these two have
in common is they are American made and much more expensive than the alternatives. I personally have a 14 year old ULS M-300 which is a work horse and gets used 7-9 hours per day without fail and have
replace the cartridge once because I flat used it up. I did have a problem with a switch once but got fixed right away.
The main problem is the ULS is 4 times the cost of the Full Spectrum. Now that Rockler is carrying them I am considering one as a 2nd machine because Rockler is pretty good about
getting involved with one of their vendors if things aren't taken care of by the tech support of their vendor. As long as it lasts a minimum of 2 years it will have paid for itself.
hope that helps some.
-nick
"Out of my mind.....back in 5 minutes"