I have the Rocket R60V and love it! It's a joy to have control of the dual boiler temperature and programmable pressure profiles. So far, after almost a year of daily use, there has been no problems except when I got a reading of an empty tank. I called my seller and they suggested pulling and re-inserting the water reservoir. That fixed it, since then no issues.
The manual recommends a once weekly backflush and I use Cafiza, as directed on the container. Don't forget to clean your Porta filter and the grinder hopper and mechanism frequently, to avoid build up of unpleasant tasting oils. There is no recommendation for descaling the Rocket; therefore, I pay attention to the water. I am using a water hardness meter, and use water that is about 60 to 80 ppm TDS.
I have a Rocket Macinatore FAUSTO Grinder. My ultimate goal is to get a pair of grinders, one for dark and the other light roast, and optimize the pressure profile for each grind type.
As for beans, I have found great vendors on EBay, of all places. Great selection, prices and free shipping.