I have a Tree Lounge now, but just put a Summit Viper on lay-a-way yesterday. I still may get a Goliath, but the Viper was on clearance at a local store for $199. Hard to beat that price.
Summit Viper (or Viper SS) are the only way to go. Everyone that I know that hunts from a climber is using one of these stands. Nothing more comfortable in my opinion.