Well worth the money for improving your tone
I gotta say that I was not at all excited about purchasing a buffer. I can get excited about a new pedal that introduces a new sound such as distortion or chorus into my effects toolbox. But not for a new pedal that does "nothing".
If you're like me and have been slowly adding pedals to your pedal board over the years until one day you count and find 14 pedals on that board, then most likely your overall tone has been slowly degrading with each additional pedal, but you never noticed because each change was small.
I was obviously suffering from this issue because when I finally bit the bullet and got the MXR Buffer for the front of my effects chain, my tone suddenly came alive. I spent the first weekend with this thing trying out every pedal I own and style of music I play and it all sounded significantly better than before. I got tones out of my rig that I couldn't believe. By the way I left the high cut and low cut switches off and the gain slider slightly past the midpoint. I didn't feel any need to tweak the settings further.
So the bottom line is this pedal is a great investment not because it sounds great but because it makes EVERY OTHER pedal you own sound great. In my case, this pedal cost about $7 per pedal that it enhanced. That's well worth the investment.