Be Careful With the ISBN's you choose! They are not all the same!

With being a new indie author, you will learn a lot! Fortunately, I have not had any issues with my ISBN because what I did was purchase an ISBN that allows me to use it wherever I choose. This allows me to keep my publishing rights, and post my books wherever I choose. The most I have to do is transfer my ISBN over to a new website that I wanted to publish through. I still maintain my rights. Have you ever purchased an ISBN that you could not take with you,  or got one for free that you could not use anywhere else? How did that work out?