Reading between the lines it appers that the optimate takes long term life out of these batteries.
I had a 916 and now my 996 both with alarms some times they don't get started for up to 3 weeks but they always did and do start and i have never use an opttimate.
I never use optimate either, sometimes months between starts this year and just jump with a car battery. Normally within 1hr riding, the battery is back to starting with ease again.