I'm actually having a Bob's Machine 4"HD jackplate installed next week.
Parker does not support the installation or use of jackplates on their boats, as they will void the hull warranty. So I waited until my warranty was up to install one...I run Tampa Bay, and the flats and need that extra few inches to get back in some areas that I want to fish.
I really wanted to see if anyone has one installed, and what type of performance they are getting...or if they are having any transom issues.