I've used the M1A on & off in several guitars for a bunch of years & like it. I think the sound quality is good for a soundhole PU & really like it for its resistance to feedback in pretty much any situation I've played in. Can be pretty much plug-n-play for most venues. I liked the idea of an active PU when I bought it but these days I'd probably go with the M1 passive as I have a good preamp that I use with the passive UltraTonic in my "gigging" guitar now.
I have had trouble fitting it in anything other than a dread, though. I have been able to squeeze it into an OM-21 & it's a really tight fit in my 00-18. I basically had to take the "wings" that hold it in the hole, off the PU, & reassemble the whole thing once the body of the PU is in the soundhole. It can be a PITA but it is doable.
Frank
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