It is incredible thin all right. Makes my laptop look downright huge and it's less than an inch high!
The 16 grayscale is better than the Sony 505 I think. Very crisp type and I don't have to put it at a larger size to read it clearly.
The text to voice is just OK. The sound is better with earphones but the speech is definitely "canned" sound and some stutter or echo for lack of a better description. However, it is nice having the news read to me while I type this note.
Since this is a new unit for me, there is a lot I need to explore and learn, but my first impression is definitely positive!