Anyone have experience with AGM or GEL deep cycle batteries?

My RV came with two AGM coach batteries. My year was the first year they were installed as standard by the RV manufacturer. I hear a lot from other owners of my RV for the model years just before mine about all of the problems that they have with the wet cell batteries as they do not maintain them properly. I never have to have that concern. They are there and they do their job. My batteries also hold a charge longer than those with my RV who do not have them. Go for the AGMs.