Sounds every bit as good as the first one I have. So not like you need to go thru a bunch of em to find the *right* one. And now that I have 2 I was able to really tell the difference in changing OpAmps... here's what I found: Stock (4559) - A bit thinner and brighter 4558 - More mids and compression, my fav LM833 - Like splitting the difference between the 4559 and 4558. Nice too. 1458 - Mellower and not as much gain Really all sound great but I like the more rounded and full tone the 4558 gives. Damn I love this pedal!!