Opposite for me! In my experience, being payed a fixed sum for a project requires a very detailed spec up front and still may lead to bickering about whether an

Opposite for me! In my experience, being payed a fixed sum for a project requires a very detailed spec up front and still may lead to bickering about whether any issue is a bug or a feature request. Being paid by hour makes it possible to continuously adjust the project without either party getting screwed.