Agreed. I saw Sparrow highly touted by friends on Twitter, but I couldn't wrap my head around it. But maybe because it reminded me of Twitter for Mac, which I can't wrap my head around either.

The new Postbox release is pretty solid and does almost everything I want.

It just saddens me that it's basically the future now and we still can't seem to get email clients that don't suck. Some are better than others, sure, but they all seem to suck in some fundamental way. FWIW, in Postbox it seems to be speed.