Did some research on the ISPLR and didn't find all the answers I wanted so I contact Brian Kender @ Switlik, the Marine Products manager. He answered a few questions I had and stressed that they only recommend this raft for aviation use. As much as I wanted to have to product fit the needs of the racers I wouldn't recommend it for several reasons:
• Most of the stability comes from your body sitting below the water line.
• Sitting below the waterline will ensure your body heat is transferred rapidly to the surrounding water = hypothermia much quicker.
• No space for a decent size ditch bag and/or supplies = no possible extended stay in the raft if a EPIRB signal doesn't go out due to a malfunction, etc.
• No room to move around if an extended stay happens.
• The big red flag was that it's a single tube. No 2nd tube like an offshore raft, no inner safety tube (even their basic single tube coastal raft has an inner backup tube).