I used the Oly XA for over 10 years during the 80's and early 90's. So here are some of my user experiences:
- it's truly a pocketable camera, very compact and pretty rugged. Without the flash attached, you could easily stick the camera into your jeans pocket.
- it can take excellent pictures around the mid apertures F5.6 to F11. Best aperture is F8. Wide open, it is soft.
- the metering is a weak point. I think it uses CDS and quite prone to going off calibration. I got my metering repaired once, but it failed again after a while. Since the camera is permanently in Aperture priority mode, there is little that can be done for reliable exposure once the metering or needle is suspect even though there is +1.5EV for backlightling and ISO settings available.
- the film winder gears is also prone to wear, so that it sometimes require a fair amount of nudging on the winder wheel in order to set the shutter trigger again
- the shutter trigger has very minimal travel, so it can be tricky to partially depress it to lock exposure.
- Due to the exposure being somewhat unreliable, it is not appropriate to use slide film for this camera. OK for color negatives and b/w because of exposure latitude available.
In conclusion, if you can find a low mileage XA - go buy it. It is best to avoid high mileage XA.
However there are many super compacts that outperform the XA -- Rollei 35, Contax T2, Minolta TC-1, Ricoh GR1V, GR21, Nikon 28Ti, etc. All of them are a joy to use, but they are several times the price of the XA in the used market.