I had a 2006 model Summit Viper and it was a pretty nice stand. Very comfortable and easy to climb with. I thought it was noisy when walking through brush or if something metal or plastic bumped it. I ended up selling it in 2009 and bought a Lone Wolf Hand Climber. It isn't as comfortable as the summit, but I think it's better everywhere else. Much quieter, quicker to set up and climb, flat backpacking. Also, I don't notice the noise my old summit had while walking through brush. IMO the LW is a much better stand.

I don't know anything about the newer summit stands than my old 2006 model. Good luck with whatever you choose.