Things I like about the Spire:
1. Design of the mobile app
2. Accuracy (depending where you wear it)
3. Buzzes to remind you to relax
Things I dislike about the Spire:
1. Battery life
2. Limited memory
The Spire is a pretty big device, so I was rather shocked when I turned on my bluetooth and the app told me the device only stores 6 hours of data. That means you need to sync the Spire at least twice with your smartphone during one day, which is a bit overkill.