Did some lounge hopping at HKG last year, and managed to access the TG F and the UA-F lounge with minimal problems. I don't think we made it all the way to the SQ lounge (or perhaps we just couldn't be bothered to go find it, I can't remember!).
We were on paid F from TG, and I don't think we had too much hassle from UA on lounge access, however, due to previous problems, I now carry a printout of the
*A Lounge Access Rules (mostly with SQ, sadly, and no, not at SIN, I know about that exception!).
The TG lounge was small, but reasonably catered. The UA lounge was much bigger on the "chrome and wood panelling", and we were offered Champagne on arrival by the attendant (nice touch as it was "on request"), but it was also a lot busier and louder. I'd go into the UA lounge if I wanted to get on-line or watch CNN, I'd probably go for the TG lounge if I wanted to relax.
(Just had a quick look, and if I took pictures of the lounges, they never made the cut into the trip report, sorry!)
Ken.
Willard the Bear - This was pre-Willard, obviously, thesedays, I think he just gets into any lounge as "my Guest"