Something that you should consider in a volume pedal is "feel". I have a cheapie volume pedal and it is always too easyto push too far or not enough bnecause it has a "free moving" feel, much like the behringer that you reviewed. There are pedals around that have a more sophisticated mechanism wherby you need to push a bit harder to increase volume and the result is more "feel". I think defintely worth the extra. I am not sure of the brand that I saw.
And to potential manufacturers, how about one where we can set an adjustable "maximum" volume for gigs/songs.