It pairs all right, but it can take up to 10 tries to get the latest Bluetooth transfer over, a few percentage points at a time.
Its remarkably short on features. Youd think it might at least be able to compute my average sleep time. But literally all it does is to bar-graph it on a daily basis. It does no reporting at all.
Its not possible to clear the data and start over. Its not possible to limit it to the latest n days so it wont keep gobbling storage space on the device.
Its not possible to delete the account and start over. Its not possible to move it to another device because the email is already registered on the other device. It has an impressive-looking FAQ, until you notice that the answer to all of the "Can I ...?" Questions is "No, you cant."
The most rudimentary things you expect on any app just arent there. Its an incredibly stupid and annoying product, even for free.