JackR - I have stayed in the Lebua State Tower and was really disappointed. It is not the 5* experience you expect. It has a really hopeless entrance (not good for cabs) and is in an awkward location. With busy roads to cross. Rooms are satisfactory but nothing special.
My preferences would be Le Meridien (great location - next to SoinTwilight - fab rooms and no problem with joiners) or the Pullman. Both much more comfortable than Lebua which disappointed.
Dust Thani is another good 5* in good location and no joiner issues. Rooms were getting a bit faded but someone mentioned they had been refitted.
Hope that helps
