I think it looks really professional-looking! It's nice to be able to easily switch from one website/app to another via seamless switching of identity providers, which has helped me avoid having multiple accounts with different services throughout life in order to keep all my online activities separate.
Having a reliable way that I can use is also great because many times when using the "wrong" provider they shut down completely or don't even respond at all meaning you are out your money and have no option of going back into them as well. I like that this app is easy to use, it can be used from anywhere with an internet connection as well! It has saved me time & money when trying new sites because of how user-friendly everything was in regards to registration process/logging into my account etc.. Nothing really at all i dislike about using nadA!! The only thing would have been if their mobile apps were better than desktop (which they are not) but overall its great.