Airport Express

[JABB]

Looking at getting an old airport express to take on hols to wi fi the hotel network in my room.
What are the differences between models, and do they all still work with the latest OSX?
I have read the latest update made the older express units invisible.

Should I just buy the cheapest off ebay or is there a better option?
Cheers

[JABB]

That seems to do more or less everything the apple one does and more. Looks good, thanks