I have used Summit in the past, would feel perfectly safe using one and do sell them and IMO they don't hold a candle to a Cougar Claw.
With the Cougar claw you can safely level the stand while you are up in the tree.
The cables are a hell of a lot better made than a Summit and you don't have to replace the shrink wrap all the time.
The stands are
100% made in the USA
All of them have a fold away foot rest built in
All the pins are secured to the stand so you aren't loosing them in the woods
The pins are coated to be quieter
The seat has a pouch on the front to keep your drinks and food close
http://www.cougarclawusa.com/treestands.htm