The app startup time on my phone (a Nexus 5) went from 70 seconds in version 1.x to four seconds in version 2.5.
The one thing I miss is the “total calm” sound – it looks like it has been removed – and I’d like to request that it be restored in a future version. That sound has always been a good goal to shoot for, and hearing it gives a better sense of how a session is going.
Overall, though, this is a great update. Much more refined and far more responsive. Kudos to the Interaxon devs.