King,
I am 6'3" tall and weigh 260 naked. I had the Viper XL until someone decided they needed it more than me and took it. A friend talked me into trying the Old Man Grand Vision. The Old Man is a good stand, but I did not like the pins in the dark. I also feel is is a little less comfortable sitting in it for the long haul. My next purchase will most certainly be the Summit Goliath. I talked to one of their guys and he said it will be great for those of us who can use a couple extra inches in width as well as the higher weight capacity. Again, the only real knock I have with Old Man is the pins in the dark. I do know you can't go wrong with Summit.