Harley, it's a tossup between the M1 and the 1800f. The 1800f ha a larger sensor thus gives better edge to edge resolution which is important if you are scanning larger than 4x5 but otherwise not. The overall resolution of the M1 is higher than that of the 1800f. I still haven't tested the DMax of the M1 but suspect it will not come quite up to that of the 1800f which, along with the 2500f was ahead of all the other consumer scanners. I consider DMax to be as important or more important than resolution (within reason). Having said that I haven't and am not going to try and do a detailed comparison of the two because the 1800f is long discontinued.
Remember, if you pushed me to a wall and put a gun to my head asking for a purchase recommendation what you would get is:
1) Wait until the software bugs are worked out on the M1 (or live with them) and buy it.
2) If you don't like 1, above wait and see what new offerings Epson comes out with to see if they are any better than the M1 (but I don't think they will be).
3) If you don't like 1 & 2 above consider buying a used 1800f, 2500/2500f/Duo Scan 2500 which, as long as it is in perfect working order (a big IF consider the age) probably will outperform all the current consumer offerings.
4) If you don't like 1-3 above then save your money for a high-end scanner, either new or used for scanning for prints that really count.
Bottom line is we are pushing the technology of the consumer scanners to near the limit and you jut aren't going to see very much more in the way of incremental improvements using the current technology. That does't mean there aren't other possibilities but neither the cost of the R&D nor the potential sales volume are likely to convince the player to spend the $$ and even if they did the results till wouldn't be that much better than what you get now. The current capabilities, while only adequate IMO, are stil pretty amazing for the price.
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