Now I need some really wet boots to really test it out.

This model does not have a fan - so there is no forced/moving air.  It relies on a little heater in the base unit, the allows that heated air to waft upwards into the boot.  I put some kinda-sweaty/moist leather Justin boots on to dry.  A couple hours later, they were "dry-er".  But not as dry as expected.  Maybe this is an overnight kinda thing...?