We ditched interstate all together at my location for work almost 2 years ago. We had way to many premature failures, some as little as 5-6 months. We now use Batteries Plus and NAPA depending on time constraints and location.
I bought a Batteries+ X2Power AGM for the Armada three years ago. It started not holding a good charge this summer, but they replaced it without much hassle under warranty. So I guess meh for the battery, yay for the warranty?