This was our team's 4th Hood to Coast, and HTCCheckIn was the worst we have used.
Initially the event promoted another app for months, and we painstakingly set that up between our 12 teammates. Then the night before the event, HTC rolled out a "new and improved timing app" specific to the event. It was great that it just required a single login to auto-fill all the teammate's information, but that is where my positive feedback ends.
As another reviewer stated, HTC Timing had far too many steps to complete at each handoff. Previous apps had a swipe feature (which ended the previous leg and began the next leg in a single motion), and this was far superior to the multiple taps required for a single handoff in HTCCheckIn.
The syncing between users was also not good. This never worked correctly for us. We would text between vans to compare what HTCCheckIn said after a handoff, and every time, the other van would be one leg off from the van that just had the handoff. Our old-school stopwatch with pen & paper ended up being more reliable for us this year.