Just bought a new Leaf and the Blink was installed the same day (happy so far). The electrician Armando from Mr. Electric was very informative - walked me through a lot of stuff, and also opened it up to take care of a few things such as
(1) new SD card (with 2.1 firmware, very stable so far, I had 1 day with the 1.6 originally loaded and it was not connecting to Server etc.),
(2) tightened grounding connections (Said some units arrived with loose nuts and were causing some errors with some)
(3) validated that some distance was maintained between two items (forgot if one was a thermostat, and another sensor or something). Again the reason was that during manufactring/shipping/storage, if those two parts came too close together, the (thermal?) reading would be inaccurate and would cause self-test to fail.
(4) I myself have difficulty in trusting wifi, so ran a ethernet-cable from the blink charger to the home router - now connecting to blink server reliably (Checking through system logs).
I think 2.1 version is a great s/w update. It has been only 4-days though, so I should perhaps wait a bit before giving my verdict.
2012 Leaf SL Cayenne Red (VIN 024633) - Delivery 8/31/12
Bay area, PG&E E-9A rate, Blink charger