Personally I enjoy not having a co founder. It makes everything a lot easier. I just get done with things. No dicussions or waiting for other people. I Work when I want and have 100% ownership. I quit my job four months ago, and live off some freelance work and subletting some rooms in my apartment. I have a shared office with cool startup people, so I don't get too lonely, but often work from home. The biggest problem I've encountered so far, is that freelancing can take to much time away from your startup project.