I'm not jazzed about BT either, except for perhaps a cellphone headset...which I'm now considering buying. Although I must say that I'm still surprised they don't make BT headphones for things like iPods.
I don't know that it's so much of a sacrifice using GA. I can't speak for other similar wares, but the expanded grafitti area is integrated as a hack into whatever software you're using. I really like it, and despise those tiny keyboards... but, like everything, I guess it all amounts to personal preference.
I couldn't really see the advantage to going "all Sony", until my friends dad got a WEGA tv and a new Clie for Christmas, on top of his Vaio. Now if the MS Pro prices would come into the realm of the possible we might be talkin'!