Upside-down, hanging tomato planters?

[bastette_joyce]

Has anyone used those Topsy Turvy tomato planters? I have a smallish balcony and do all my growing in pots. The area gets lots of sunlight. I thought maybe those planters that hang upside-down might be a great use of the space I have available. I've seen the ads, but I'd like to hear from people who've actually used them. Are they as good as the advertisements claim they are? Any problems with them? Are there particular kinds of tomatoes that would be better grown in these as opposed to being planted in a right-side up planter or in the ground (eg, cherry tomatoes vs full-sized)?

I'm in Oakland, and it's usually sunny in my neighborhood.

Thanks!