If you're tired of tripping over your cord or stepping on it, this will free you up. I've stepped on cords in the dark and it's not a good thing. Cords are fragile and it seems like they'll start buzzing and even quit when you least expect it.
If you like to move while playing, this is a must. One of the reviewers said it played great when he was 225 feet away. What? Playing with out a cord gives you freedom to dance, walk, run or whatever.
I like the rechargeable battery that's built in. It has a USB plug for charging and it's good for 5 hours. Even if you aren't a player that's all over the stage, this is a nice addition that gives you one less thing to worry about(your cord shorting out).