I have several BT speakers (Bose SoundLink, Jambox and FoxL Platinum) and for personal listening in say a hotel room or office, the FoxL has the best sound via it's apt-x BT (when not using my 2013 MBA, I use a JayBird apt-x adapter for the source music). It really is about as close to an "audio file" experience one can get form a very small (this thing is TINY but REALLY solidly built), compact, personal BT speaker, especially when having it powered from the wall (goes to 8w output from 4w on the battery) and when powered and wired via the included AudioQuest cable, it can sound down right outstanding if the source file is of a decent bitrate. Using BT with apt-x and powered is nearly as good. Crisp highs, clear mids and solid structured bass (and twenty hour battery). It WILL walk on you if you don't use the included rubber mat!
Now, of course it doesn't have the pounding bass or room filling sound of the much larger Bose SoundLink or even the newer Bose Mini (although I tend to not like the Bose Mini DSP with its highly colored bass). Neither of these Bose products come with apt-x which i think is a shame. it REALLY does make a difference to my ears when used with my MacBook air with apt-x enabled from the OS. Quite impressive.
Anyway, just my two cents. The FoxL v2 Platinum with apt-x is quite an outstanding little piece of kit.