I have been using the red top optima's in most of my vehicles for quite some time. A couple of years ago I had 3 failed red tops, 2 of them were more than 10 years old and 1 was less than 6 months old. The newer one had me a bit pissed off but after reading through this thread I now know what caused it to go bad.
The battery in question was used in a Dodge diesel with dual batteries, both Batteries were changed from flooded type to Optimas and there was a good bit of corrosion on the battery cable connectors, I did clean them up when the batteries were changed but I guess I didn't get them clean enough. one of the 2 batteries didn't have a really good contact and that battery lost it's charge, but that wasn't the battery that died, it was the other battery, I'm sure that the draw on just one battery was just too much for it to handle, causing the charging system to run the voltage high enough to take out the battery.
I did completely clean up / replace all the corroded connections and every thing has been good ever since.
By the way the older red tops were in use on vehicles that saw a lot of winch time, heavy off road usage, and long storage times inbetween outings. 10 plus years isn't bad.