iRex Digital Reader 1000S
I'm an engineer and I have been using IREX DR 1000 for some months in 2009. I used it for technical articles, reports and books in A4 size PDF formats.Screen is nice. Large enough for A4 documents, which would be barely readable with the other smaller e-readers.PDF can be easily viewed with a good the zoom and pan functions.SD memory is a great PRO, since you have large memories ( I tried up to 8 Mb ) and easily switch between several SD's.Unfortunately is dramatically slow with large PDF, if you open large