thats a great find!
they are GOOD alternatives between STOCK and Total loss performance levels ( including cost and headache factors)
the enhancer has hotter than stock spark energy ( more consistant at LOW RPMS as well) AND alot more timing advance down low with raised rpm limit.
couple it with a light flywheel, and slightly advanced stator plate, and it has GREAT bottom snap.
not worth $259 to me though.
EDIT: never, ever, NEVER get them wet! if your ebox leaks, or you sink your boat, you must dry it out immediatly!
the stock CDI will survive this sort of thing, but the waterproofing of the MSD will NOT.
FYI... keep them dry!