"AppHarbor - It's Heroku for .NET. You simply can't beat it."
I agree with most things in the article except for this. Its definitely my personal opinion, but I don't think AppHarbor is quite 'there' yet for a lot of companies. At least it wasn't for our company's specific needs. The .Net community is very unique and has very different expectations from other service providers. We typically eat what Microsoft feeds us and trust it. Microsoft is definitely putting a lot of weight behind Azure and it made sense for us to use their platform. I saw the level of support behind Azure first hand when our company was invited to Redmond to meet the dev teams as part of an early adopter program.