Nice review. As another long-time PDA reader, I decided I wanted a bright-sunlight reader, and narrowed it down to the Astak 5" or the jetBook.
The difference boiled down to: the Astak had DRM capability; the jetBook was cheaper. Since Bed, Bath, & Beyond sent me a 20% off coupon about that time, the jetBook was a _lot_ cheaper, so I bought it. The characteristics of the two readers are very similar, down to some of the flaws you mentioned in rendering.
I miss my old Compaq Aero 1550. What I'd really like is a WM6.5 PDA with a 5" reflective LCD screen in an aluminum Rhinoskin case.

I'm not holding my breath. Oh, and a pony.
Regards,
Jack Tingle