I thought the Ambient wasn't reading wind correctly, but after getting the Tempest, my wind speeds have not changed. I'm so protected by mountains on both sides of me (I live in a low area at the top of an inverted V formation). As such, I'm never going to get the impressive gusts that other, more open locations can get no matter which station I have.
As for the Tempest, it's decent, but you better get a separate rain gauge or way to measure melted snow in the winter because the hepatic rain gauge won't pick up snowflakes.
Turns out the Ambient was a good PWS, and I'm actually thinking of buying another one.