Does anyone have any experience with the Dunk-Kit full immersion firearm cleaning kit from Cylinder & Slide?

1.75 Gallon UNIVERSAL DUNK-KIT

I've been doing a lot of shooting the past year and have been falling behind in keeping things clean. This looks like it could be great, especially for my P7's where the gas delayed action results in powder residue getting basically everywhere. I'd love to give them (and my other pistols) a full cleaning in every nook & cranny by just dunking the whole think in a tank, swishing it around, and hanging to dry.

Any good or bad opinions? Any competitive products out there?