I got SmartQ7 + fw5.2 + comix.
Have done manga and comics with no problems.
I can read everything so far except proprietary formats like LIT and Repligo...
PDFs work fine too, even heavy vector graphics, and scans have zero probs.
Of course it's not as "sharp" as an ereader, but I read it in the dark, in bed, without waking my wife; or I read it in the day NOT under sun.
if you're a reading-in-the-park kind of person, only an ereader (for now) will satisfy you.