My friend's got a 5'5 GBuzz Ive ridden a few times. Thing flies and feels real good in mushier stuff, can also be turned and hold its own in the pocket. One of the better feeling grovelers in my opinion.. I've also ridden a 2x4 as a step up and it absolutely went off in walled up clean overhead stuff. I've been dying to try out a Superbuzz or a Thing. Some people don't like the deck channels but they don't bother me. I am a big fan of the sk8 decks too. Of all the people I've talked to who have a stretch, everyone has said they love it.
I just bought a used Stretch 5'10" "What". I've ridden it twice now in waist high a-frames and its pretty much blowing me away. The nose is really wide, but with the lightness of the board it just whips around in an instant making it feel like a shorter board.
I've had 8.......there's nothing that compares. The attention to detail is crazy, the fact that stretch actually shapes every board makes it worth every dollar.