Reviving this thread based on my experience of trying this. I got one free from my mother and bought another (different brand) from Home Depot.
I knew they would take more watering but had no idea of how much. I live in central Texas and we are already in the triple digits of dry, hot breeze daily. I had tried twice a day with a drip system - soaking twice a day and that worked for a while but when the plants got bigger and the temp rose by 10 degrees, I would find them wilting by the end of the day. Now I am drip watering 3 times a day and it seems ok.
I suspect that in a more humid and less windy environment these might work better. Also, I think next year if I do it again, I will plant cherry tomatoes in these and my better boys on the ground in cages.
However, the jury is still out. I have a lot of green tomatoes on the vines and because I have an automatic drip system, it may work out well.