I received a fully assembled PLA model a few days ago, and everything is working like a charm. I used the recommended Repitier-Host for my Mac, with all of the Robo's start-up settings. Soon, I'll start tweaking the settings to test the ranges of heat, size, etc. for various filaments and projects. NOTE to PLA users, the online manual tells you to set the temp to 230 degrees in the section titled "Test the extruder with initial burn-in temperature" in Chapter VI. When I did this, it started to melt the printer bed. The manual did indicate a lower temp (190) for the PLA parameters in Rep-Host, so I should have carried that info over to the testing... At least the melt is far away from the normal printing area. This is my first 3D printer, so I don't have anything to compare. However, this unit has exceeded my expectations. Most of the stuff we have printed are mods of stuff on thingiverse, although I'm working on developing a 3D model via http://www.123dapp.com/catch.