I pulled down HLT PH version when it was released for Android used it on the HTC M7 had issues with it keeping connected with the Q818XT. It would record some laps and not others. After a few updates and when I switched to the M8, seems to be more consistent. I also had a hard time reading it when I was running laps. I was trying to figure out how to just get a simple screen show something like this:
All I want to know is if I am green, purple, red and by how much clearly and then flash my best, current for the session without really taking my eyes off track.
I think it is great but fiddly to get setup initially, in terms of data logging I like the way AIM does it better, I attempted to use the laptimer and OBD2Link MX for data collection just is a bit cumbersome, but again the price and dedication that goes into this app it's not a big deal plus I am glad Android has support. (Big Thanks)
This is how I set mine up, dont know if its optimal but seems to work ok.