re #1. I don't have a problem with this. I keep my recurring, monthly bills in folders (also using Windows filing system) labeled according to year. It only takes a few seconds to find what I want. If one does want to append a scan to an existing one, doing so in Adobe doesn't take that long (I haven't explored scanning with the s1500 directly from Adobe yet). This scanner is so fast and convenient, the extra time to append documents is not a problem.
re #3. Actually, you can back out paperwork already in the scanner without canceling the scan. There is a little tab on the edge just above the scan button (the lower tray has to be opened up). Just pull up on it, open the machine, retrieve the paperwork, close the machine and reload the paperwork. The software shows the last scan. Just click if you want to keep or rescan it.
I know the help screens are a pain to use (lousy layout), but going through them anyway may save you some future headaches.
re #4. I've run several different sizes of paper on each run quite frequently. No problems. Each document needs to be centered in the scanner, however, not aligned with one side or the other.
re #5. I spent $25 for the Deluxe Bundle. That is a small percentage of the total price of the machine. While I didn't even bother to load Rack2-Filer into my computer, I don't regret spending the extra money since my needs may change later and I was curious to what the software was about. I'm thinking the other software (other than ScanSnap Manager) are also part of the Deluxe Bundle (I got the impression the copies on the non-Deluxe Bundle are trial versions which cost more separately than the bundled price).
re #6. Acrobat runs just fine on XP with SP2 (I don't trust SP3 yet). I haven't loaded Rac2-Filer yet.
Post edit: I'm running Acrobat on XP/SP3 now without any problems.
The advertised specs call for a twenty sheet capacity in the ADF. You can't expect good performance when exceeding specified capacity. Again, read the manual.
I've rarely had problems with text bleed through when scanning thin paper. When it does happen, it's usually too faint to be a problem with documents such as receipts. The really rare times it's a problem, I've been able to get around it by switching to simplex scans (a quick temporary setting made by right clicking the scanner icon in the tray then clicking on Simplex scan) and feeding the offending document one side at a time. Most of the documents I've encountered where this happens has only recurring boilerplate on the backside. I keep one file with the boiler plate and just scan the front side only from then on.
I agree, it would be nice to preset several scanning profiles but it takes so little time to set the profiles, I just don't worry about it. The advantages of the machine far outweigh the disadvantages.