I purchased the fishman rare earth humbucking pickup largely based on the reviews I read on amazon and other forums.  I must say that I am extremely pleased with the sound.  I am using in on my Guild D-4 and playing through a fender acoustisonic amp.  a little reverb and a little delay and it sounds amazing. Previously I used a basic Dean Markley pickup and it buzzed pretty bad.  No buzz or hum with this one.  I  would 100% recommend this pickup.