I never cared for the Aerco. IMO it's sonics are just a slight step up from the Beyer MV-100, but no where close to a Sonosax, V2 or V3. I supposed if you need a small preamp that'll run on 9 volt (or whatever sized it uses) batteries, and you don't want to part with $700+ for a used Sax, then the Aerco is a good option.