Well, my Hexar RF is my first (and very recent) RF camera. When I bought it I figured that Konica was so far out of the photography business that if the camera breaks then my alternative would be another camera (given all the electronics and electromechanical stuff inside). I think its probably a very robust and reliable camera, but even the best things can break.
Because I've enjoyed the camera so much, I've even thought of getting a 2nd Hexar RF body (GAS? so soon?? a term I was unfamiliar with 'till recently!) Just In Case. Hey, if one comes along cheaply enough I'll do it.
But if I were really relying having something to make photos with I'd want a purely mechanical camera. I have a beat-up old OM-4T which has proved reliable as hell and has suffered a real beating while surviving quite nicely, thank you. It's never let me down, and I hope it never will. But if I were going somewhere where a functioning camera were critical, I'd take a purely mechanical backup for it (an OM-1 for my OM; a mechanical M-mount RF for my Hexar RF). Backup, mind you - not primary camera.
As it stands, though, I'm not doing things that are "critical circumstances". For my purposes I've been shooting digital, with my OM-4 as backup. Right now if I were primarily shooting with my Hexar RF, and in non-critical circumstances, I'd probably take either the OM-4 or the Canon dSLR (and light prime lens or two) as backup to the Hexar RF.
...Mike
[edit]P.S. Gid - if you'd like to PM me what you want for the Hexar RF body I will think about whether that's "cheap enough" for me. While I don't want to pay a bucket of money for a "spare part", I'd hate to pass up a good opportunity if one's on offer[/edit]