[fjtorres]

I have an older Plustek Opticbook 3600 and I find it fast enough.
I *used* to have access to a very fast professional grade epson scanner (100ppm with the sheetfeeder) and the scan head return speed was fast enough that for dual-page scanning the limiting factor on speed was my ability to flip pages and align the book. Usually I could scan a full technical report (20-40 pages, grayscale 300dpi) in about 5 minutes without rushing.
The same applies to the Opticbook; *I* am the bottleneck.
For me, that is fast enough to archive my older, dying paperbacks.

Not all scanner vendors publish full scan-cycle times; they usually only report the single-page scan speed but not the head return times so be careful with advertised speeds.