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oops, made a mistake...
After reading Harayasu's question about how strong they are, I wondered if we were talking about the same thing. We weren't.
I have a couple of tents where the pole system is built into the tent, and it works like an umbrella. You push the center up and lock it in place, forcing all the poles straight, which makes a sturdy (but heavy) tent. Sorry for the confusion.
They aren't very good tents. I've had both the throw and pop ones and the umbrella types. They are designed to appeal to the market based on the novelty more so than the materials utilized. They aren't particularly stable and are much heavier than normal tents. I wouldn't recommend them.