The wife got me a GFS Retroverb for my birthday yesterday. Spent about an hour with it and it's very nice, especially for the money. I know it's a rebranded Biyang but it really sounds nice, especially in Spring and Hall modes. I highly recommend it to those who need a little reverb now and then and don't want to spend big bucks. It really sounds just like my old Fender amps in spring mode and for $69 bucks it's a steal. True bypass and stereo as well.