I have both a Tempest, Vue, and a Cocorah.
The tempest overestimates rainfall. Yesterday, Vue .04", Cocorah .05", Tempest .14". The rainfall algorithm is still decent though.
The tempest also underestimates gusts vs the Davis, sometimes by a significant margin.
The radiation shield on the tempest is by the far the best I have seen, especially with the small size. Wonder if they use a combination of solar and wind to correct?
Anyway, my two cents.