I have two climbers that I hunt out of all the time: a Summit (Goliath) and Ol Man (Grand Ole Man). I believe both these stands are the biggest models the companies offer (I'm a big guy and like to have lots of room).
On the positive side, both stands are easy to get used to, both are pretty quiet when climbing and both are rock-solid when you get to your desired height.
On the negative side, both stands are heavy (20# or more).
The Summit is a bit easier to operate because of the "dog-knotted" cable used to fasten to the tree as opposed to the way you have to drop a key through a cable on the Ol' Man.
I find the Ol' Man a bit more comfortable for extended sits, but both stands are very very comfortable.
95% of my bowhunting is done out of a climber, so I've gone up and down trees in both of these stands countless times.