I have used Optima's Blue tops for years, I even transferred 2 of them 17 months ago over to our new toy Hauler. I run 6 Blue tops with a 480 solar system and 5500 watt Onan.
I took all 6 out this spring and had them checked by Optima dealer. All were performing as advertised.
No worry, no boil over or electrolyte loss. We boondock 90% of the time so having reliable AGM's is a must for us.
You will see many here bad mouthing Optima's or AGM technology, I would never go back to lead acid batteries. Been there done that.............