Just Purchased a Used G-Class! What to Expect?

I recently acquired a used Mercedes-Benz G-Class and I'm excited to share my thoughts on the experience. I've been a Benz enthusiast for years but this is my first time owning an SUV. What are some must-knows when purchasing a pre-owned G-Wagen? Any tips on what to expect in terms of maintenance, reliability and overall ownership would be greatly appreciated.