I have the summit goliath, just a bigger version of the viper. they are the sturdyist climber i have owned and are east to set up, take down and are very comfy. A friend of mine just purchased the lonewolf climber and likes it also. it is lighter and acording to him is quieter when climbing but it is pretty pricy$$ in my opinion you cant go wrong with the summit line up. good luck on the bear