I have four out right now; three with tomatoes and one (that has three planting holes in the sides) with zucchini, yellow squash, and cucumbers. I have "harvested" two yellow squash and three zucchini, and will be begging people to take some tomatoes in a couple of weeks. I am going to have a HUGE harvest! By the weekend, we'll have enough squash and zucchini to grill for the whole family.
Our landscaper dropped by today, and he was amazed; he has a garden but he said he's going to get some of these next year. I never thought about it, but they are weed-free.
I got them because we have moved to a fairly rural area and there are deer around. I can't try to grow anything outside the patio fence, because we don't want to fence anymore of the yard.