I'm not trying to be a jerk, but do a search for those stands and you'll get all the information you could want. This topic comes up about a dozen times every year.

Personally, I have the Summit Viper X5 and I like it OK, but not as much as many people on this site. It is definitely safe and comfortable. I personally think it is large and awkward and not as quiet climbing or packing as others that I have used. The teeth that grip the tree work almost too well when your climbing and descending with it, especially descending, in that I have a hard time getting them to 'let go' of the tree. I struggle with it nearly everytime, yanking and shaking it with my legs just to get it to let go. There are a lot of straps and bungees that seem to get caught and tangled on everything and some hunters on here even suggest using more to help keep it quiet while packing it in and out of your site.

That's just my 2 cents. I have an old Loggy from 1989 that I like abit more, but itdoes not feel as safe, and definitely isn't as comfortable as the Viper. But for hunts of 3-4 hours, which is what most of my hunts are outside of the rut, I try to stand the whole time anyway, so the comfortable seat doesn't matter.