Regarding comparison with TG F, I have a very bad experience with them when a flight was delayed at BKK and they messed up handling of F passengers very badly:

http://www.flyertalk.com/forum/trip-...-horrible.html

So I guess if everything is OK and you originate in BKK, then TG F ground experience could be fantastic. But if anything goes not as planned, then they fail - you are better be on your own than relying on them to do anything.