Never played with the stylus, but heard good things.
That said:
Olympus XA advantages:
Manual focus. Manual aperture control. It tells you the shutter speed that it's selected. Backlight exposure compensation (+1.5ev, but you can't use in conjunction with the timer).
It's little, really little - unless you've got the flash attached, in which case it's just little. Quiet. So quiet that I've taken a photo of a guy at work from 3 feet away and he didn't know, even though he was waiting for me to take it. It doesn't look like a serious camera so it's nice for surreptitious street photography.
Whilst it ain't the fastest small rf camera around, the auto shutter will stay open for a looong time if it needs too. I've taken a well exposed photo of my wife and I in a cinema during the commercials!
It's KEWL factor is way up on anything else comparable.

Oh, and most importantly, it's got a great lens - very sharp:
http://www.rangefinderforum.com/forums/showthread.php?s=&threadid=1950
Olympus XA disadvantages:
Low light focusing is a little difficult, but not too bad. Light seals tend to go bad (I've just repaired mine, and about to pick up first roll since the repair, I'll let you know). Wide open, the lens isn't quite so sharp, and tends to vignette.
It's a very, very nice camera, and a lot of fun to shoot with.
Cheers,
Steve