The Ricoh 500GX is excellent, but it's slightly bigger than the camera that's my all time favourite, the Olympus 35RC. The difference, however, is measured only in a millimetre or two, and of utterly no significance in choosing between them. The Rikenon lens is a little smasher, but it's matched by the Zuiko on the 35RC, though which you'd prefer could be down to a coin toss. My coin fell on the side of the 35RC, but I wouldn't argue with someone whose coin landed on the 500G/X side. The Ricoh has the advantage of an extra slow speed, having 1/8 to the Oly's 1/15. The only difference between the 500G and the 500GX is that the GX has a little lever that will cock the shutter without winding the film, and it's sure not a reason to pass on a 500G whilst waiting for a GX to show. One of the things I like about the Oly is that the shutter speed dial is on the top plate, which is where it should be for a camera with a shutter priority autoexposure mode.
Both of them use naughty batteries, and in neither case do they work anything except the meter, so it's no loss not to have a battery.
For looks, whilst the Ricoh at first sight has a 'boxy' look, the lines have soft contours and it's very pleasing on the eye -- moreso, I think, than the 35RC. On the negative side, replacing the light seals on the Ricoh is rather more of a job than on the Oly. The first thought that goes through your mind when you pick up either of these is, 'I want to take pictures with this!' They really are that inviting.
I've never been put off by the fact that they're fixed lenses. If I need interchangeable lenses, I reach for the Bessa R3A ; I had thought of buying a Leica once, but I didn't want to settle for second best. (There, that should have the Leicans swallowing their tongues in apoplectic rage...)