In short...........YES..............
The VFE standout is very good but the Maxon ST9 Pro+ is absolutely killer into a stock 2203 or modded 2203. I got a Maxon ST9 after watching Killtertones video and it's crazy good into my Splawn modded 79 2203 with stock levels of gain on the 2203. The pedal drives the shit out of the 2203 and the ability to adjust the mids and highs really add to how aggressive you want it.
Here's Killtertones totally stock 2203 verus a Dual Recto and the Marshall keeps up with the Recto IMHO. He is using SD Black Winter pickups in the video.