I recall Lee Roy Parnell spoke quite highly of it. I purchased materials to make myself a clone, but it fell to the bottom of the stack. Maybe I should move it up the stack a bit. Its main distinctive characteristic is use of an op-amp chip that few, if any, other overdrives use, a CA3260 dual op-amp. I've seen the single op-amp version (CA3140) used in some things, but never the 3260.