I remember, when I used it for the very first time in commercial project. Client briefed me in the afternoon, the next day, before the noon, she got ugly app, but with fully working admin backend. She was sold.

But I also remember, that some non-standard requirements were really difficult to implement or get around.

Having that in mind, the next project was entirely in Pylons. All was good, until we were asked to add Unicode support.

Since them I'm on Rails.