I was just at Lowe's today and they had them for something like $9.95 also.
I wouldn't really trust them or ever use them unless you are absolutely unable to plant in the ground. Growing out of a pot would be even better I must assume. I believe the hanging baskets are nutrients and water, and even though some forms of hydroponics (which this sort of is) produce very well, when it comes to things like vegetables and fruits you grow and want the best flavor you can get you should always grow in soil.
Just my opinion as an amateur farmer but I would never use one of those hanging baskets for tomatoes if I had any other choice.
Just a few pics of this years grow. I have about a total of 200 something tomatoes growing, I lost count.
Roma, Moreton, Ramapo, Delicious, Goliath, Giant Belgium, German Giant, Hillbilly, Big Boy, Big Rainbow, Black Brandywine, Cherokee Purple, Giant Pink Oxheart, Black from Tula, Behemoth king. Those are my current strains I have growing.
and some of the little seedlings...