It seems (by the look and by posts on other forums) that the GFS pedals are re-branded BiYang (sold mostly on eBay) pedals. The price/feature point on them is very attractive. I have been tempted on several occations to buy one (BiYang) from a seller on eBay, but never did. The one that caught my eye the most was one that had a user-replaceable op amp chip (thru a hatch on the bottom), and even came with several different ones, including a 4558 "Tube Screamer" chip. Let us know if you take the plunge on one of them.
By the way, my pedal collection includes some Behringer stompers, which also have a very nice price/feature point.
"...and I am outta here!"
Scott
Guitars:
Dean EVO Exotic Burl, EVO Special, Vendetta 1000 FR, Stagg Les Paul copy, Squier Standard Telecaster, Squier MIK Stratocaster
Amps:
Fender Princeton 65 (solid state), Vox AD15VT, Peavey Windsor Studio, Crate Vintage Club 50 2x12
Pedals:
DOD FX40B (x2), FX50, FX52, FX55, FX65, FX67, FX80
Washburn LSESLD, LSBOD
BBE Free Fuzz
Behringer EM300, VP1, PH9
Dunlop GCB-95
ProCo Rat II "The Rat"
DigiTech Bad Monkey, RP90
Rockman Soloist
and many, many, many more!