The RAT style circuit has been replicated in all shapes and sizes and the Mooer black secret certainly has its own character in terms of size and sounds. There's much more treble available than on other models yet this sits more in the fizzy range which can clash with symbols in a live or recorded environment, however, dial the filter control to refine this and you have a good sounding RAT.
The Black Secret also uses the LM308 chip which can be hard to find nowadays so this is a point for the Mooer! Another thing we noticed was how well it cleaned up, not unlike an early RAT. Although this isn't normally the reason players buy a RAT it's nice to have this option for some unique tones.