The above are all excellent points, and completely true.
I went with Red because of the size, quality, price.
I come from a Camera Department background, and I can see the appeal onset with the Alexa.
I shot with the Alexa just last week, it was excellent as always.
The post houses that I prefer are the smaller boutique ones, (who's staff often worked for the big old established ones before going out on their own). I find that they are very well informed and very helpful. They are also affordable.
But when I am talking with some producers that want to stick with their known post companies. It's a battle to push Red. If I can direct the post to my smaller guys then it's all easy and great!