Well, I used this yesterday...
Mentholated Col Conk Amber for prep
RazoRock Green Label for the shave
Col Conk is under-appreciated as a shave soap. But it melts easily, then absorbs menthol so readily, and is so residually slick that it is the perfect prep for yours truly. If you want a slick menthol boost to your shave tomorrow you should stickify some Conk today! Lime+mucho menthol is my fave.
It is practically a daily driver in my routine, so I use more of it than any other stick (or puck, or croap). I owe it some full shave use, but my other soaps are already jealous!