I got this preamp a year and a half ago to use with my Realist Lifeline pickup (that I love), in hopes of getting a less 'amp-y' upright sound out of my amp. The Lifeline had gotten me my favorite fundamental tone from swapping pickups, but still sounds like a pickup.
Experimenting with the pedal, it was nice, but did not quite make my DI sound as 'beautiful' as I was hoping for from the marketing. Still sounded like a pickup, and since that's what I was trying to change, it would not have been worth the price - until I started experimenting with the second input.
Long story short, my setup is now running two pickups at once through the Stanley pedal, essentially hi-passing a piezo wing pickup only for top-end clarity and mixing it in with the body from Lifeline - and it has changed everything. My amplified sound can get so loud and clear, and I am even blending it in with a mic when I record. The preamp was worth it for me.