I like how easy it is to use, you can make links shorter than 35 characters without much hassle or problems! The only thing that could be improved would probably have more options in terms of what type/length your shortened URL will end up being (such as no-follow vs follow). Also if there was an option where we had our own domain instead so when someone clicks through they are directed straight away rather then having them go back into their browser etc - this makes sense because most people don't know about these services unless told otherwise by others but also saves time too!!