I used TTS for around 3 yrs on my 2012, no real issues. It works really well. I had the black dongle so I had to drag a computer everywhere. With the new units you don't need to, but on the other hand, you really can't see the cells your hitting or missing during the vtune process. I switched to Powervision with target tune for the new bike. That works well also. Being a person that likes to tinker the PV has advantages, but the TTS is solid. I like the TTS software a little bit better, might be because I'm more familiar with it though. The documentation for the software, TTS is a clear winner. PV has more convenience to it. Really nice to be able to see the cells you hit or miss, plus you stop save the changes, save the tune, and flash to the bike, and your off for another tune or data run without ever having to get off the bike. Both are very good systems, you can't go wrong with either. For me at this time the PV/TT is as good as I need it to be.
Current, 2015 Roadglide, FM Jackpot 2:1:2, FM air cleaner, PV, Target Tune