I purchased this round timer when schedule changes meant that I had to leave my CrossFit class. I still wanted to do a modified CrossFit so I use this timer along with a wireless headset to grab a similar workout no matter where I am. I like that you can control the music from within the app. When the phone is in "landscape" orientation its easy to see the timer from across a room. You have to take some time to set up your timers, but once you have them set, works perfectly. I have had this about a year and I am very pleased!
Amb2016 about Interval Timer Pro, v3.0.3