I put two red tops in June 06 and have put 40,000 miles on the X since. In almost 3 years, never had a problem. The yellow top in my 12' dump trailer spent 4 years in my Thunderbird SC prior to the past 2 years in my trailer. No problems. I have a 2 year old red top in my Z06 that was fully discharged because I left my XM radio receiver on. Recharged it per the site instructions and no problems. I have 2 three year old blue tops in my Scarab and another 2 year old blue top in my Maycraft 17' CC boat. No problems. I don't mind paying extra money for a good product and, IMHO, Optima batteries are a very good battery. The AGM technology creates no corrosion like lead acid batteries and can be mounted in any position.

DSMMH