Last year I spent many hours trying to work out just what the Gut Slider idea was about, and I had some of the most fun times getting to know it !
I got two second hand boards to understand a lower volume board compared to higher volume one.
I went 6'0 x 23 x 2 7/8 and 6'3 x 23 x 3. I'm 104kg and 179cm tall (just under 6 foot).
I also wanted to understand flippers V no flippers and also the difference between a GS and Boogie Board.
Firstly, the Boogie with flippers is a hoot but not on small / fat waves. I found getting onto weak waves hard but on bigger days, a whole heap of fun, resting the arms to kick out the back, dropping into close outs etc etc. I can see why so many love it.
The Gut Slider is IMO the board for when the Boogie isn't the board. It only works in 1-2 foot waves.
I took mine out to Cronulla Point on a 3-4 foot day a got punished so learnt the lesson quick !
It does however turn those small to flat days into a great surfing day as they glide into small waves amazingly and section connect effortlessly.
Flippers and the GS don't play well together. The boards are just that bit too long for the hips to move like they need to in order to kick (unlike a BB), unless you drop back on the board and have it sloped out in front of you but then you are pushing water so really, the ideal scenario is to be standing on a shallow bank without flippers and / or paddle as you would a surfboard - which is where volume comes into it, as under volumed boards require effort and for me, I wanted high float an ease of paddle.
The fins are critical. You don't want to 'slide', you want to grip and hold a line and I've tested some fins in mine at Urbnsurf and I couldn't imagine the GS without fins (this is the difference between a belly board and gut slider I imagine).
I ended up with 2 boards; a 6'5 x 23 x 3 1/4 and 6'2 x 23 x 3 1/4 and l find that I can prone paddle them like a longboard in deeper water and pick up any wave I wish too; most notably, the inside waves no one else wants or can catch !
My 2 custom boards are below and I'll post some other wave riding pics separately.
My time on the Boogie and Gut Sliders was due to some ongoing knee and hip issues. I'm back on SUP and longboards now but always take a GS on small days and BB on bigger days to turn a no surf day into a big smile day.