How great is the difference?

The way I've understood it, semi-transmissive screens are made up of uniform pixels that are both transmissive and reflective at the same time. "Transflective" screens on the other hand seem to use mixed dedicated transmissive and reflective pixels... At least this is my conclusion after a little Googling on the subject.

To me it seems like the effect should be about the same! -Readability in sunlight should be more a question of the ratio transmission/reflection than the method to achieve it... Perhaps the transmissive type could be a little grainier if anything?
Anyone had a chance to compare the different Zaurus models outdoors, the SL6000 with transflective vs the semi-transmissive ones?