I don't know where people are coming up with bad reviews, I've bought 3 battery's from them, and my last one lasted 4 years, Probably because i keep my ATV in the garage year round, and on a battery tender!
If you leave the machine outside, especially when it's cold, any battery suffers some. And a lot of the ATV, motorcycle and side by side stuff, DOESN'T HAVE Alternator like a car or a Truck which replenishes the battery! I live in Colorado, not Oregan, also!