I have noticed my teeth are whiter, however
Anyhoo... 1.4.1 + latest PRL + latest helmi kitchen OS (with phoneext dll patch from mr wonderful luv2chill) has finally given me a slight improvement in bars (might indeed be running the radio at slightly higher power there, chill) and about the same battery life as I was getting before, with the old R4 3.5 helmi rom, previous PRL and radio...)