Fascinating thread - I don't have an XA but I am considering one now...!
Is the XA the only rangefinder in the series...?
The plain XA is the RF and was followed by the simpler XA2 which is zone focussing and has a programmed shutter. So you just P&S with it. The XA is aperture priority. The XA2 was slightly improved and became the XA3 with a +1½ EV adjustment for backlit shots (like the XA has) and takes DX films.
Zone focussing is very easy to use in the XA3 and XA2 but the XA's RF is better (just). The XA 2 and 3 are f/3·5 not f/2.8 like the XA.
All of them benefit from a complete service but need a specialist to do it.
There's also the XA1 which is very basic, no batteries required, only 100 or 400 ASA film accepted, etc, etc. And there's the XA4 which I've neither seen nor used.
The flash comes in several versions; the A11 is commonest and the A16 is more powerful. Both are usually left at home.
Although I love the XA it does slow you down thinking about the aperture, speeds etc: it's aperture priority but the speeds are indicated by a needle in the VF. The zone focusing of the XA 2 and 3 is a delight to use and it is a programmed shutter. So a pure P&S. Also the XA2 and 3 are dirt cheap...
Dropping an XA can be very expensive, I've owned one from new and know the hard way, which lead me to the XA2 and 3 but I've an XA in the heap as I missed the thing.