I've had my VP1 since June 2004. After the initial purchase, I moved the ISS package from my roof to a post in the backyard, and bought the remote anemometer kit for the anemometer which remained on the rooftop. I also added a Weather Echo Plus.
Battery life on the ISS board has been poor, and so has reception. (Started OK, but got worse over time.) I went so far as to toss my 900 MHz phones and buy 5.8 GHz ones, just in case they were causing interference.
Sent the ISS board back to Davis last year about the battery issue, they replaced it without question, hassle, or cost.
I love the station, love the setup, love the Weather Echo, I just wish I got better reception. I'm only disappointed that Davis provided no upgrade path to the radios, and that my lithium batteries last only a few months.