My friends and I ordered take out and got the small (16 oz.) frozen hot chocolate. First impression was chocolate soft serve ice cream blended with ice. Very good but not worth $8. My girlfriends and I could only drink half of it. I'd recommend sharing between 2 people a 16oz. You can also request chocolate shavings.
The decor inside looked kind of dirty and tacky. It smelled of hot dogs. I think it's a bit too overhyped. Perhaps we had to actually sit inside to experience serendipity?