I purchased the pro as I really liked what I was in the app. however, I had to stop using it as it caused a HUGE drain on battery life. It accounted for 70% battery usage in the 1st 8 hours I used it on my device (you can check this in iOS settings> battery > battery usage section). Ive used MileIQ for about a year now and have to go back to them. This just doesnt work for me due to the battery usage issues. Fix that, and itll be much better.