Haven't heard anything bad about them other than the price!
But if it lasts, which the lead acid 6v have a bad reputation for not doing, then in the long run it evens out.
They are known for being vibration resistant, spill proof, and withstand extreme temperatures. The Optima also claims to have quite a bit higher cold cranking amps than a standard group 1 6v lead acid.
From what I hear about AGM batteries, they do not like being discharged, fast charged, or over charged, and for sure not jumped from a 12v battery!
As long as your charging system is working properly, and the cost is not prohibitive, I think they are a good investment.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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