I completely agree, and I will add one more thing: when you change how the product looks or works, make sure that users - especially inexperienced users - can e

I completely agree, and I will add one more thing: when you change how the product looks or works, make sure that users - especially inexperienced users - can easily find the documentation and tutorials that correctly describes the version of the product that they are attempting to use. I would guess that out of ten people who run into a situation where something does not work as described, maybe only one or two will push through the frustration and go on to become power users.