I have yet to try the optimas, because of the price tag...sounds like the guys that have them like them though.
Best I've had were the Trolling Thunders, but cannot find them anymore.
I use Cabela's AMG 1205s now. They will hold a strong charge for 2 years, and I replace about every 4. - Always use a low continual charge when you're not on the water.
And Cabela's has them on sale right now if you want to check them out:
http://www.cabelas.com/product/Boati...3Bcat104446080