I had a rotor for 2 years and just about could not fault it. Tool-less disassembly, quick to strip down, very rarely jammed, excellent battery life. The only problems I had with it were with it feeding reballs, and swapping lid/speed-feed around is a pain.
... Enter my Spire. Again, tool-less disassembly, even quicker to strip down than the rotor, hasn't jammed yet, good battery life but not quite as good as the Rotor (Rotor claims 50,000 balls on 3xAA, Spire claims 20,000 balls on 3xAA), feeds even dirty crappy reballs without issue and the speed you can swap lid for speed-feed is brilliant. I cannot fault my Spire so far.