I saw a Maybach drive through the city a few weeks ago. To this day, that one was the only one I've seen being driven on the road. When my dad was buying his Merc a few years ago, I had a close look at the Maybach they had at the dealership though - beautiful car. Feels like first class on Singapore Airlines inside.
I came across a GT just like this one, albeit a hard-top coupe, tonight on the highway. Ended up next to him at a red light, where I revved a bit, and it got him to floor it off the line. The engine sounded absolutely magnificent (and I was in a good position to hear since my Polo had no chance of keeping up