Hi there
I found my sound with that overdrive. So I'm planning to buy another SL Drive and combine my rhythm with my lead sound.
You can configure this pedal in four kind of tones, I mean that It's awesome!
Many people says that pedal contain a plexi in It's core ..mm I've to say that I actually never I played a Marshall Plexitone, but you can get tones from Hendrix till Tony Iomi, about that I've to clarify that it also depends on the guitar and the amplifier that you uses and between the four switch configurations plus the setting of the pedal, volume, tone and drive.
Well I really think that pedal its a big deal. I hope my words help you decide on this purchase
Cheers