I own a Summit Viper and a Lone Wolf sit and climb. The Viper is a comfortable stand for all day sits however I have some issues with it and will not use one.
They are noisy. Steel cables going up and down the tree coated with a plastic material that will crack/split in one season. The stand seems to creek if not set on a perfect tree. Climbing, the viper has these plastic stirrups you insert your feet. Not really thrilled about them.Standing up, the upper platform can fall hitting the bottom platform. The stand can slip on a wet or frozen tree. I had one slip on me last season and it dropped about six feet. Almost cut my finger off and thank god I had my safety harness attached. If you stand too close to the tree on the viper, you better have your harness on. Carrying through the woods they are big and hang up on low lying branches. Like a bucket seat strapped to your back.
The lone wolf is the only climber I will use. The belts are rubber with v grooves. They grip the tree and are super quiet. They have a much finer adjustment then the viper.The top and bottom lock down together with straps. It folds flat and packs very nicely. If you go with the lw, go for the wide model. Gives you plenty of room. Yes it costs more, but it is a much safer stand imo. The Viper wins on comfort but I don't trust it.