I don't own one but based on clips I've heard I like the Wampler Plexi Tone better than the Catalinbread DLS that I did own. When I need Marshall tones I really like my LovePedal COT50 w/Angus mod. This one delivers. Bought it fm a guy here on TGP.
Ok, played it for a while today. The presence control really adds a JCM 800 type sizzle to the top end while still maintaining the base tone. This also darkens it up a hair which will be helpful to bridge pickup tele/strat single coil folks. Pedal has that great Marshall classic tone to make about any amp at any volume get extremely close to that sound. I even plugged it into my Vox AD5 solid state modeling amp and it sounded pretty good.
Cleans up great with the volume knob, and rolling the tone off of neck AND bridge pickups really yields that hard to nail "woman tone" and others.
The switch is totally silent through the amp and the signal never goes through it since it works off a relay.
Other than that, the 1st version and this sound and behave the same way.
Definitely a keeper, and one to check out through your rig if that's the sound you want.