We use GAE for our app (http://www.webfilings.com/ http://www.webfilings.com/) and have had quite a bit of success with it. It really depends on your usage. For

We use GAE for our app (http://www.webfilings.com/ http://www.webfilings.com/) and have had quite a bit of success with it. It really depends on your usage. For certain types of applications it makes a ton of sense and is still quite affordable.