I bought 200 100ah in November 2018. I wanted to use them for a while before I wrote a review. So far so good. They replaced 400deep cycle 100ah flooded batteries which never really got good service from. These take up less space, are a lot lighter. They're supposed to last a lot longer. They are preforming well. I want to add more by the end of 2019. I'll update my review then.