In a word, kick butt. I've heard a few youtube video demos recently, so I acquired some new gear, and I must say I couldn't be happier. The Yamaha FL-01, from their PSE series of yesteryear (1980), is probably THE flanger sound which every flanger aims to emulate, though it was a later design, it is probably the most capable I have yet acquired to date. You get Leslie rotary organ on tap all the way to that super modulated flange heard on countless records. The pedal can operate from 9 to 15V (need to replace a .1u ceramic cap off the input opa to get past 12V) if you really are serious about headroom, but 9V is just fine for all the clean swirl you could ask for. I removed the plastic door for the interconnect jack and connected a barrel jack to battery snap adapter, wired it for reverse polarity, and fed the end through the door; it works. Panasonic MN3007 bucket brigade. The Maxon Flanger FL-303 mkI (1976) is the most "vocal" flanger I have heard, which uses the Reticon SAD1024 bucket brigade and runs at 18V. You can dial in swirly chorus or get that EVH tone which launches you like a rocket. The Reticon gets PRETTY CLOSE to a "zero" sweeping pass with the dry signal, something which Panasonic chips don't do. I lucked out on finding one with a working Reticon, and it wasn't cheap, but worth every penny imho. Some Reticons are plagued with heterodyne noise, I have a DOD 460 Mini-Chorus which suffers that, but this one doesn't have any, so call me double fortunate on that account. The last one is a Nady (Guyatone) PS-018 Jet Flanger (1984). It boasts the widest range on all parameters out of all my flangers, but no self-oscillation like the FL-01. I can dial in some crazy "swooshing", but where this flanger really shines is when stacking my FL-01 into it, the swirl bliss this thing produces is out of this world. Because the MN3207 is employed, it's rise is not as "resonant metallic" as MN3007 circuit, but produces a more "consistent" effect throughout its sweep. All three can stack before or after dirt or modulation, or stack all three together for some swirl bliss! I now have decided to flip every other flanger I have in my collection, once you go old-hat, you don't look back! The others I have are mere kids toys in comparison. Anyone else have a hidden Japanese gem of a flanger out there?