Just got this little guy. It sounds amazing. I had talked with RetroTeleRod awhile back about it and I finally pulled the trigger as it was on sale. I'm running two compressors, both optical based. One is more versatile and can do subtle and squish (XTS Fermata), and the Yellow Comp is a great tone sweetener. I could definitely see leaving the Yellow Comp on all the time. It really is a very natural sounding comp to my ears. My first Mooer pedal. I love it so far.