I really wish I could answer that--I was looking into it myself earlier this year. Depending on where you are you might be able to audition their A21 integrated and get a taste of their sound. Tone Imports is the distributor, but I don't think many carry their separates in the states. I did find a magazine review that mostly loved the clarity and purity of tone, but found the power lacking (measurements were something like 23 watts @ 8ohm & 28 @ 4). And as Stereophile measurements show the MA 300 to be more like 87db efficiency instead of 90db, it's probably not a great match for larger rooms or louder volumes.
FWIW I ended buying a used First Watt M2. If I could upgrade every piece of my system but one, that'd be what I kept. I haven't dealt with them, but Reno Hifi sells Pass Labs & First Watt online, and do allow for home auditions. They could probably also best direct you to the model that would best match your speakers & taste.
FWIW I ended buying a used First Watt M2. If I could upgrade every piece of my system but one, that'd be what I kept. I haven't dealt with them, but Reno Hifi sells Pass Labs & First Watt online, and do allow for home auditions. They could probably also best direct you to the model that would best match your speakers & taste.