I don't know the 300 or the Kobo, but my PRS-505 is rather on the slow side. Particularly when opening large books, as you mentioned. The PRS-950 on the other hand is much faster and smoother. PDF on the 505 is particularly bad on the 505 compared to the 950, which may be an issue if your tech books use that format.
Basically I fast began to convert everything to LRF when I used the 505, as the reader handled that much better than everything else.
Last edited by Belfaborac; 07-01-2012 at 12:18 PM.
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