I had one and liked it,the parts aren't to plentiful though.I'm not too sure I'd let her start w/ that particular one.
The first thing I would check is the adjustment of the balancer chain.There's a counterbalancer w/ an adjustment on the chain,mine was at the end of it's adjustment at 21,000 miles,I would have had to source a new chain;if the chain gets too sloppy it can snap.The 2 piece cylinder heads on the TX(when they designated it an 'XS' 500 they made a 1 piece cylinder head)had a tendency to leak around the gaskets where the 2 halves met which required removing the top cover and re-torquing the head every other season.
They're a Great bike and I wish I still had mine,you just need to keep up w/ some maintenance items to make it a rock solid mount;sourcing parts can be a pain.
I would remove those pods that's for sure and install the stock airbox again;the OE filter is a paper one. I think if you can look around for some parts now before you buy it and if they're available Buy it. Don't run it w/ those pods and that lean jetting anymore though !
These 4 valve heads are easy to do valve adjustments. I may still have a few gaskets in storage from when I had mine.