It's pretty amazing how the difference in object quality between the enthusiast and professional systems has evaporated.

I would be interested to hear how frequently the Printrbot gets a clogged extruder vs. the Stratasys, what print quality on ABS looks like between the two units, what happens when you have a more complex shape with a lot of overhangs, etc. Aside from warranty service, what are the advantages of the professional system?