Lot of varied opinions on which is more useful, versatile, and/or easy to work with. Harley likes the sert but at $4-500 why wouldn't they? They also claim more versatility with the sert. Outsiders like the PCIII and say the sert has no accommodation's for timing changes which can be essential in most mods. Any experience out there? Have always run and had good luck with PCIII but would like to satisfy curiosity on this one.