Best thing ever for many things
I have two of these. One kicks around the studio and gets used on stand up bass, banjo, mandolin, and whenever acoustic instruments that have pickups walk in the door. The other one is permanently part of my own violin/fiddle rig. Of all of the properly loaded piezo preamps this one is the most pleasing, most properly tweakable, most rugged, and has no more or less than the features you actually need to get a good tone from all but the crappiest of instruments. I also use the one in the studio as an electric bass and guitar input into my recording rig often, especially for those older lower output bass guitars. With some gentle tone shaping applied on the way in, so good! I was also pleased to discover that if you blast the input into distorting it has a nice warm fuzzy surprise.
This thing is rugged. I have casually abused the one that lives with my fiddle for over 10 years and it has yet to really show any signs of wear. Also, the battery lasts a VERY long time.