Last year I bought a Macho Man Disc frame on ebay to replace a crashed bike. I wanted to use as much parts from the crashed bike as I could, so I was searching for something with QR and post/ISO brake mounts, and not a lot of money.
I didn't know too much about All City at the time, but I still get a lot of comments from people who look like, well, other bikers. The bike rides really well, and it still impresses me how smooth it is when I transition to gravel. It's not high end steel, but it's comfortable and I'm only marginally slower than on my old aluminum bike. It's also the heaviest road bike I've ever owned, and I no longer obsess over weight like I used to.
Based on my experience, I'm also intrigued by the Cosmic Stallion, and can only imagine it rides better than my boat anchor. The only thing I wish the Cosmic Stallion had was flat mount brakes, but only because that looks to be the new "standard" for disc brake mounts.