To me, it's worth the risk (warranty) to flash a custom rom.
When I bought it (about almost two years ago), I wanted to... throw it outside my window!!! Didn't like almost anything of it...
So, before I... do that throw, mates of mine told me to take the desision (finaly!) and flash one "cooked" rom.
Next thing after the flashing... was to wondering, if I bought a NEW/DIFFERENT device!!!
(THAT much difference! And that's why, I can't understand users here - or elsewhere - asking official roms to flash! Except the warranty issue, to me, there is no point to using official roms.)