I was very close to buying this unit last month. It was a tossup between the 660 and the MP-2>R-1. The MP-2>R-1 setup ended up costing $50 more, but I think with 24bit capability and the ability to power for longer (MP-2 can go over 50 hours on my 9v walmart, and the R-1 can go 6-7 hours on x2 2500mah NiMH's), I made the right choice (for now). Now that I've got Neumann's, the test will be whether the MP-2 is too warm for them. If so, I might opt for the 660 if 16bit is fine for me. I like that your review used Neumann's, and you enjoyed the sound. Transparency with these mics is definitely a plus. Thanks for the review!