I've never heard of Roland having unreliable keybeds.  They've always been known for having good action.  Now some of their cheaper models of course will have a lower quality keybed, but nothing so cheap that reliability is an issue.
_________________________
GEAR:  Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller).  SOFTWARE:  Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.