I have it, remote ignition and start. Handy some times, and it does occasionally startle a few people as the bike rumbles into life by itself.
Built my own though, and the neutral switch still over rides the system, so not a problem left in gear, which I never do anyway.
I've streetfightered mine (well work-in-progress) and I've removed the ignition switch altogether, and use a disk-lock if necessary (steering lock/ignition switch integrated). Yet to disable the start button though, as I'm still making sure the system is reliable, and thinking about integrating an alarm/solar re-charger into it.
PS it cost about $100 I think, I used a remote kit that I bought a few years ago, plus a couple of relays, wiring, connectors etc.