As for the self-watering feature, I think it's a nice idea but doesn't work as well as I had hoped.
The float within the tube seems to stick and get stuck in positions other than the actual water level.
I bought two of these planters this spring, as I'm trying to make my garden more self-sufficient, and a lot of the features are really nice!
The casters make it an easy pot to move, even when fully loaded, and the gauge makes it easy to see when the reserves are getting low.
It was so easy to put together and the floater was in the tube and working fine.