I just upgraded from Fedora 17 32bit to Fedora 21 64bit (LXDE spin), and then installed via “dnf” per the instructions. Went without a hitch, and I’ve almost completed Chris Gammell’s “Getting to Blinky” tutorial. It is all running really great! I just viewed the PCB with the 3D Viewer, and am totally blown away. My machine is a 10-year old Pentium dual core with 1 GB RAM. I am very pleased with the performance.