The FM adjacent channel selectivity is moderate, likely around 20 db which means it outdoes the bSangeans/b& Sonys thay I've tried, (and the GE Superadios) & it can tune FM in 10 kHz steps (yes, 1/20th of a channel). ...
I have gone through almost all of the Sonys and bSangeans/b and you can't beat this one for the price. BTW, the best portable FM only "pocket radio" I've tried is the Zune 30. Amazing reception and it has RDSS or whatever they call that ...