I have a pair of Summit Vipers. The only thing I might would change would be to get a third one!!!
I can sit in these things all day long. Very quiet, very comfortable and I feel secure enuff to nap in them, not advising that you do that of course.
One thing I would recommend, the safety harness that comes with the stand is very solid and serviceable. But, I would highly recommend getting one of the integral safety vests/straps. They are much easier to put on, don't get tangled and I think would work much better in a fall.
Good luck.
Hank