I have an MP-1 with AS MA-2, and the combination is astounding. Just so much better in almost every respect than other preamps I have tried, including the much vaunted Mark Levinson 32 reference preamp. I cant, however, comment on the MP-3, but would certainly endorse the MP-1 as a wonderful linestage preamp.
Atmasphere preamps
I have read some wonderfull reviews on both the atmasphere preamps I linked to through their website. One reviewer seemed to prefer the AS mp3 to the Cj 17, FS pres del, and the Lamm LL2. I did not find much about their preamps in the audio forums, so I thought I would start a new thread on them. How do any of you with first hand experience feel about these preamps, and what amp do you use with it that works well. My amp is a Vac ( kt-88 based) and speakers are the Vandy 5a.