I went through 3 Optimas Blue Tops this Summer alone in my '06 Seadoo Speedster before finally giving up. They were all replaced for free, and the dealer (Seadoo) checked everything for shorts and couldn't find anything. I unded up going with an Interstate, used it twice since I installed it and haven't had any problems. Of course it's out for the Winter now, but it didn't give me much faith in Optima.
I installed a Red Top in my Jeep in Spring of '05 and have had to replace it twice now (agian for free), but I'm tired of having to replace these things. I'm not abusing them, just normal service.