I have an R2. I have just started using it. They use Cura to generate the gcode files by default, which is not nearly as nice as MatterControl. I am working to configure a profile in MatterControl to build gcode files for it.

The printer is designed to only be connected to by IP. So until MatterControl adds an IP connect, this will be manual file management, which is a shame.

Overall, the printer is very nice. I have had to add a support for the extruder cables, so that they do not drop down into the top of the printer and block head movement. Kind of amazing they did not find that in testing. The printer runs a full level before each print, which slows things down a bit for lots of small prints, but makes sure the alignment is right. The fact that the build plate is both heated and really easy to remove (the simplest I have tried) makes part removal a dream. And you can use an iPhone/iPad (and Android, I expect) app to monitor the print process (as long as you are on the same network), with 4 simple steps to connect to the printer.

We have recently purchased a Monoprice Maker Architect 3D printer. At $300 US for a fully assembled printer, we had to give it a try. The printer does great, and we only had to install 2 screws. However, the default software was a mess. And we had no support with out MatterControl 1.3 that we LOVE so much (having used it with a K8200 we had all last season). We were really worried. Then we installed the 1.4 update - with MakerBot support! We told MatterControl it was a MakerBot Replicator 2, updated the settings given in the Maker Architect manual, and voila - we have it working. Thank you for the wonderful software, and the very timely support for MakerBot systems over the USB (virtual serial) connection!