I use this at the very end of my pedal chain, mostly as an aid for writing music. The controls are intuitive and easy to learn, but the volume can be a little fiddly to set just right. After the first loop, you can record over and over to add layers to the loop and then solo over it.
I find that it can make the sound slightly darker, but that is easily compensated for on the amp. I have no idea how long a battery would last as I always use it with a boss power adapter.
Pros: Super sturdy construction
Easy to use
Decent sound
Cons: No memory for storing loops for later use
Not particularly cheap
Summary: Great looper if you like boss pedals.