Congrats! I have been using an Airave since 8/2009, have been happy with it, as my signal in my house is very bad....I have a few points for you.
1. It can take a long time to find and lock on to the satellites for the required GPS connection. This is only a problem if you have frequent power outages.
2. It uses only 1X for data. My Hero sometimes says EVDO while at home, but i believe it is alternating between the actual cell tower and the Airave when this happens.
3. If you are downloading something on your computer while connected to the same router the Airave device is, the call quality sucks! I can hear the caller fine, but they claim I break up terribly. There is a bandwidth limit I understand.
4. If you are on a call and leave your house, the call will seamlessly switch to the regular cell tower. This doesn't work in reverse, however. If you are on a call and arrive home, the Airave will not pick up the call. I ususlly tell my callers "I am arriving home, I will call you back in a minute."
5. My wife has a Samsung Instinct, and because of the Airave, her phone almost never receives calls while she is at home. There is a known incompatibility between these devices, aknowledged by both Sprint and Samsung. Something to do with the data being received to her phone (email updates, etc) via the 1X that the Airave limits it to, not allowing phone calls to come in. If her phone is not receiving data, the call will come in. She will be upgrading soon to a new phone.
Again, congrats on the Airave, and I hope this helps you and others.