Mine seems to be fine
I purchased one of these units on Tuesday, connected it up that evening and waited - I called Customer Services the following morning (they say it will take up to 24 Hours but I am impatient) and was told there were provisioning problems and that it could take a few days to activate. That evening when I returned home lo and behold it was up and running.
I now get full 3G Signal throughout my house and today started using it for calls in anger - I get excellent voice quality, no dropped calls so far and the unit has been working fine since it was activated sometime on Wednesday, I don't think I have missed any incoming calls as I have taken a few calls with it and have had no irate emails.
For me, so far, it has been a good experience - I have virtually no service inside my house and this has made my life lots better as I don't have to stand on the wall at the end of my garden to take a call now.