I just sold a Gokko "Vintage Box" which is a knock off of a knock off, aka 'American Sound" by Joyo and a few other names. It actually sounded great running into the amp, but really came to life using it as a pre-amp into the power amp of an 80's Peavey Studio Pro 112. While I have only played a couple of late 50's Deluxe amps, (and it was a long time ago!) my opinion may not matter, but I was very impressed with the late 50's D-lux type tones, plus much more. It also has the character knob that changes the voicing. Actually, a great $35 pedal.
Sold it because I'm old, sick and I ain't gonna gig no mo, so need to start passing things along. The fella that bought it was a very nice, hipster looking fella in his 30's.He had just bought a keyboard amp for cheap and will use this a pre-amp for a toneful, inexpensive solution.