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I LOVE my TT15 for the Bark Indicator! Nothing like a pop up box on the screen telling you which dog is barking more the 20/40/60 times a minute. Especially if you are on the move and can not get an ear on them.
Chuck I have not noticed any difference in the distance between the collars yet but where I got my collars from the TT10 and TT15 were the same price. So when I went back to get more collars I got the TT15.
Also the TT15 and TT5 can be tracked by the 320 and Alpha (not at the same time) So if I had a 320 I would be buying the T5's so if I ever upgraded I could keep using the same collars.