I used this pickup for years. Some people compare it to making your bass sound like a giant fretless, but it never lacks for fundamental. Also, everyone in the band hears every note you play. I like to use it through an amp just a taste to compliment my acoustic sound and it's like buttah! After using a Realist for a minute, a Bass Max for a second, and having my FC crap out on me, I pulled out the Underwood to help me get by, maybe while I had my FC fixed. WOW. I forgot how much I liked this pickup. It can be a horrible sound if you don't match impedance, but when properly EQ'd it's beautiful. After playing on it again, I realized that I had forgotten how quick it is with reproducing a sound. I'm playing a little lighter, and my notes are jumping off the bass, with a bit more expressiveness! With the Realist, it seemed as though I was working alot to get a good sound through the amplifier. The bottom was always there, but the high mids weren't. The Underwood seems to produce a great tone for me, quickly, and when paired with my acoustic sound gives me tone, allows me to play with more "chops" than other pickups, and growls much more when I want it to. With a large, loud band, I can turn up and be heard alongside the drums, note-for-note. With a small group, I can have the amp barely up, making a sound that will give me a little "bump" in the mix so that all of my notes are heard. I forgot how great this pickup is, and quite frankly I'm digging how DIFFERENTLY I play with it! I thought I would try to find out how many of us out there use the Underwood, and like it. I respect the opinion of every Realist, Bass Max, Fishman, Barbera, Revolution, et. all user out there. I understand why you don't use the the Underwood, but I'd like to hear from those that DO. What do you like about it? Do you use one element, or both? (I use both--cord on the 'G' string side) How long have you used it? Do you blend it with another pickup or mic? Preamp? Eq? Show some love to the Underwood Pickup, talkbass!