I dont want to dirty up HS thread with a competitors kit questions.
I own both and they both have their pros & cons. HS kit is more modern and can run in stealth mode IE - boot direct to a default game. MD kit will boot to 96n1 welcome screen and you go from there. MD kit has 96 variations of pacman and some creative games using the original PCB hardware. HS saves kit swaps the color proms and show games like Pacman plus correct with green mazes.
Both great kits but you get current support with HS one as I dont think Mike is making any updates to his.
Just my .02