Hi Tony,
I have been running a Jawa classic just about every day for the last two years , just entering the third.
23 BHP , not a lot but depends on your requirements. I don't actually need a GS to travel 16 miles to work on B roads or dual carriageways.

The problems I've had are limited to;
1; replacement ignition switch early on which was replaced under warranty immediately and with no quibble. Has been fine ever since.
2; the weird electronic rev counter not always working , although it does now through entirely it's own devices. Not a serious fault.
The other more annoying thing I've had is the starter switch failing. It is starting to fail for the second time but I note that Halfords do something similar for less than three quid!

I could go on about the good points. It will buzz along happily at 65 if you want it to on a dual carriageway. Good , of course on the back roads.
When I did my obsessive research before I purchased the word I kept coming across was reliable. I can't really argue with that. I have never been let down as even with the ignition switch and starter button problem I was able to start it on the kick start.

I find it a surprisingly comfortable bike and have kitted it out for the winter this year with screen , hand guards and leg shields for a mere £250.00.

Take a look at ADV rider. There is a young couple who have travelled extensively in Europe over several months fully loaded and two up on a Jawa 350 , fantastic!

All the best.