Super fun, but only after you become well versed in how to set-up and take down the slack line. Make sure to find sturdy, mature trees. Make sure to align slack line with tree protection. Make sure to pull through as much line as possible before beginning ratchet the line. To understand how tough the line needs to be, well, that'll take some experience (along with the instructions). Make sure to hop on and have fun. And don't worry about looking goofy, just make sure you have fun.
This is a fun and hard way to work on balance and core. I started like many people with just a primitive system which is a lot of fun and also a great work out. But this is a different monster all in its own. I know many people who believe in strictly using a primative system talk about how much easier a ratchet system is and in some ways it is. But also it is harder in some respects as well such as when you get extreme tension on the line with the ratchets you have more surf and sway in the line. Personally I like using both systems because they are both awesome but this is a little bit easier to travel around with and set up in my opinion.