BTW, I've been getting out and using the M10 a bit more lately.
For moe. this past weekend, I did a comp of:
Night 1) A comparison of the M10 A/D to the Sound Devices USBPre 2's A/D: DPA 4022 > Aerco MP2 > SD USBPre 2 and then digital out UB2 (optical) > Sony D50 and UB2 (analog) > M10
Night 2) A comparison of the Aerco MP2 + M10 to a USBPre 2: Again DPA 4022, splitter cables to Aerco MP2 > M10 and other split to USBPre 2 (optical) > Sony D50
The first comp is a direct comp of the M10 line-level input (essentially as A/D + recorder) to the line-level input (A/D) of the USBPre 2.
The second comp really is lumping together the mic preamp of the Aerco + the A/D of the M10, and comparing to the USBPre 2 acting as both mic preamp+A/D.
I haven't listened much to the Night 1 comp, but the Night 2 comp is really pretty close in sound. I can hear the typical transformer sound of the Aerco compared to the non-transformer USBPre 2, but both sound very good.
DPAs > Aerco MP2 > Sony M10 should make for a very compact, high quality recording rig.