Optima built a reputation, and then sold to Johnson Controls, who kept the name and the flashy red case, but moved production to Mexico and I'm guessing started using cheaper materials in the batteries.
Like Odyssey, back in the day Optimas weren't available all over the place; you had to go to a 4wd or speed shop to get them. Johnson Controls bought the name and now every napareillyzone in town has them.
The last two I bought were in late 2009. Bought two the same day. Both were dead in 6 months. I swapped them for new ones under warranty and thus far the new ones have lasted BUT some I bought around 2007-2008 have croaked over the last couple of years.
As of now, the family has two tractors, three CJ's, and two pickups that were all running red tops up until things started going south with the brand. I've been running redtops on all those vehicles starting in the mid-late 90's, and the quality and longetivity has DEFINITELY decreased in the last few years. They might still be ok, but they aren't anything like they used to be.
The last battery I bought was a Deka Severe Duty (farm battery) and it's held up ok, but doesn't hold a charge when parked for extended times like the old Optimas would. That's why I'm going to try an Odyssey/ Sears plat on the next battery.
The first Optima I bought lasted 7.5 years and that was HARD, HARD use. Most I've had have lasted at least 6-7 years. When they started crapping out in 5 years or less while being used on stock pickups and SUV's (light use) I looked for another option.
The Odyssey seems to be the way to go (for now at least). I'll get a Sears platinum simply because I have a sears local to me and the warranty should be easy to use if I need it.
I have no doubt that Odyssey will eventually be sold off, cheapened, and go the way of Optima.