I just sold my IREX DR800SG. I've settled on a Kindle DXg to replace it (bought the Sony 900 first, but it doesn't suit me). I already miss IREX's ability to use a Table of Contents in PDF files, and the DX is obviously bigger and heavier, but uncertainty over fallout from the bankruptcy has scared me off.
I think something might be wonky with your IREX or your files. In my experience, IREX has very fast page turns (except for the initial .pdb wait as mentioned above). IREX page turns are faster than those on my Kindle 2, Sony 900, or my old Sony 300.
You might want to revert back to the 1.0 firmware and then re-install 2.0 RC3. I had a weird issue in that I could not calibrate the screen after upgrading to 2.0, and the screen offset was problematic. When I downgraded and later re-upgraded, the problem went away, so maybe your page turn problem is also the result of a glitch in the firmware update process.
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