I have the slightly older XB10 model, which is very comparable. The sound is very good for the size and they travel well, including multiple trips to the beach and pool.
I appreciate that you can link them together for a true stereo sound from the speakers. I will say, my set is kindof flaky, and works about 90% of the time when I do that–sometimes the speakers don’t talk to each other. However, I would recommend that if you want to get 1, go ahead and get 2 because when it does work, the stereo sound is fantastic.