Lengths: currently 6'8", 6'8", and awaiting a 6'10".
I have had already and resold a 7'7", 7'10", 6'6", 6'9", 6'8", 7'4", 6'9"
All between 115 and 125 liters, for my 100kg. Widths between 29.5" and 32.5". Shapes totally different each time. Single, Cheyne Horan Starfin, twins, thrusters, quads, 5-fins..
Tried a 5'11", definitely fun on small waves, but you need to hone your skills first some time on 7'+ and 6'+ boards first
I have also a longer SUP at 7'11" for faster paddling speed, for going to outer reefs, or when the waves have no precise peaks, and you have to move a lot on the spot to catch waves. My longest board is a 8'3" nowadays, but I bought a 8'11" semi-gun for my Hossegor trip that I will resell there.
All production Gong or Drops boards, except 3 custom Gong ones. Various constructions: PVC sandwich, simple glass, bamboo layers, full carbon...
"The row is in your mind". Seriously, if you are asking how much row a board, that means your paddling technique needs work :-). With technique, you can have "anti-row" on these boards (turning when paddling on your right), as they are so sensitive to the paddle movements. Paddle like on a 10' and you will spin in place. You can look at the technique I detailed here:
www.standupzone.com/forum/index.php?topic=15897.0 and here
www.gongsup.com/forum/viewtopic.php?t=1623
The secret is to practice a lot on flat water and very slow and small waves. These are the kind of "waves" that are best to train with these boards
A powerful paddle not longer than your height is mandatory.
With training, it is very easy to get in a wave, whatever the size, if it has some "push" in it on take off, if you can feel a kind of "hard bump" in the wave face to push on it to take off. Their very slow paddling speed makes them hell in case of rips, wind, lots of water movements, hostile crowds, and not adapted to contests where you need paddling speed to position yourself for priorities.
The idea behind these ShortSUPs is to have the same board length as you would have on prone surfing, to get the same take off rush (a real "pop up" feeling), speed (less wet surface) and acceleration (be able to pump the board like on a skate). Also, you can commit fully on your front foot to drive the board at full speed in turns without having to stall / dishpan somewhat to avoid catching the nose as on a 8'+ board on small wave faces. The secret of their shape is to hide the needed volume away from the rails to keep rails thin enough, and to think of the board as two boards side-by-side and not be focused on the overall width. It allows to enjoy short non-oceanic waves, by exploiting every inch of the available wave faces. But at the same time, with the ample width, keep a lot of stability in the chop.
This is different from the small SUPs you see now in contests, around 7'6", where riders try to get as narrow and low volume as possible, to cut as much as possible on latency in turns (no need to move your feet around a lot), and have faster paddling speed and easier rail-to-rail and vertical on hollow waves.