The best part of this is that you can output the gears as SVGs. For example, gear + Glowforge =
http://community.glowforge.com/t/gears/143/4
Tested video gives a good overview... youtu.be/0R3mMUsHFvU
Need to see more reviews showing negative aspects. There's always negatives.
Edit: found a negative: shipping price. To Australia it's US$1380 for the model with air filter. That's crazy. Almost 2 grand Australian dollars for shipping.