I'm only starting to print and am quite delighted with my results. I brought the RBX01 second hand with maybe one use for a very reduced price. In my limited experience printing 3d I've been able to print various objects that I have downloaded fairly well. I'm still experiencing growing pains but the simplicity of this printer does compensate.
I've not had to use anything to assure that my model pieces did not stick to the surface of the heated bed, and I printed some very small pieces indeed.
I started out slow since I hadn't immediately found the instructions included on a usb card. Once I went through the calibration routines I found that it was quite simple to print a model. The software that runs this printer is downloadable from the CEL website and is Linux friendly.
I'm very happy with my purchase and hope to be using it for several years.