The ups are that I planted six Minnesota Midgets inside one tomato cage and they did great, the melons grew up in the air and then dropped onto the ground when they ripened (deep mulch helped the landing). Total area used was about 2 sq feet.
The downs: I planted Hearts of Gold (HooDoo) not knowing that they stayed green when they ripened so by the time I checked most were rotted on the bottom. They were inside my "deer cage" in front of my corn, a small plot surrounded by high deer netting. The plants are dieing off and I don't think the other half will get to ripen.