tried one
as a flat water cruiser they work, not great, not a lot of speed, bad if it gets windy...but if it gets people out into nature Thats fine
Costco had some cheap one online I believe.
Inflate able as a surf craft in waves... nope, pretty crappy.
We use to have 5 boards (2 longboards) in a 650 ft square EV apartment on the fourth floor.
You might be surprised as to what fits and doesn't fit ...
You might want to look at short and stubby Simms SUPs, haven't tried one yet but I have scene old men with huge guts, stick like legs and zero skills paddle them into waves.. SO I assume they work well.