Have the Ricoh one listed above since the past couple of weeks. No paper jamming as of now although it is being used for around 7-8 prints per day. Also took around 30 photocopies and scanned a couple of docs with it. Must say it is very handy. Coupled with official toner refill program, I'd see no reason why one shouldn't go for it. ASS is onsite as well.
Before buying this I saw the thread on DesiDime where a couple of posters did talk about paper jamming. The onsite service engineer though rectified that glitch soon enough after a call, they cited.
As for the printer I have, I'm thoroughly satisfied with the print quality. Photocopying too is a breeze and with the USB slot, you don't need to turn the PC on for scanning anything (the scanned image can be directly sent to the flash drive) . Photocopying as is doesn't require computer to be on. I'm not sure if one can print directly through a flash drive though (but the idea does seem a little extreme).
Am waiting to see how many pages i derive from a single cartridge. 95% of docs i print in the toner-saver mode. The sharpness even in that mode is excellent. With toner-saving off, prints are noticeably darker when looked at closely or under a rich source of light. However, there is no way to tell how much of a difference will this make in terms of the eventual no. of pages printed using the two modes.
Ricoh advises up to 3 or 4 refills per cartridge before changing it for good. Furthermore, they seem to offer two types of toners for refill; high yield and low yield. I'll personally be happy to refill till the time the print quality deteriorates too much for my liking.
A word on the scanner though; it is strictly average. The photocopier OTOH, does a better job for me than what i get with the local shop ones for Rs. 2 per page.
There are also network enabled versions of the above Ricoh model out there.