I would consider the comments by Mexicowanderer very closely. We've used Lifelines in this and the previous Class A, a 2008 Allegro Bus, and boondock extensively. We push the batteries hard with a residential refrigerator and up two two chest freezers when fishing in Alaska, along with the rest of off the grid living. I manage to keep the batteries at 12.0 or above and charge exactly on the recommended profile from Lifeline.
Unless there's been some major breakthrough that I haven't seen, I'd say the North Star claims are questionable. AGM's are great if properly charged and not allowed to drop too far, and if you can do that, you'll be very pleased with their performance. We've used Lifelines for a total of 8 years (2 sets for different coaches) and will buy new ones if and when these die.
