I've owned several Optima batteries in my different cars, red yellow and blue tops alike. Blue is meant for Marine, Red top is standard, and Yellow top is a deep cycle. While working at my old stereo shop in Spokane, whenever we did any high-end systems ($5k-100k) we would always install at least one Optima battery. I've never ever had any problems with the Optimas, and I refuse to use anything else. Sadly enough, I currently have some POS battery from Batteries Plus in Gertrud, but will be switching it over to a yellow top before summer. I highly recommend the Optimas. They are more money, but it's like comparing our Mercedes to a Honda [

] In the end, you get what you pay for.