I have the Gen 2 NSR4:
Almost exclusively limited to suspension fork Mtn bikes is probably the largest issue. Having the front tyres spin in the air means I have to snake a bungee cord thru the wheels when travelling long distance. I’ve had two different bikes pop off of the prongs on two separate occasions. Much play between the folding upper and lower. It’s a long way to lift a bike up. Especially when I have a bumper mounted receiver. I see why they abandoned the sailing hardware.
ReductiMat has had a 1Up about the same amount of time as my NSR4. He’s done nothing to his; I’ve media blasted, repainted and added SS hardware to mine.
There was Arbutus for a brief moment. But that was bought by another company.
For myself a Princess Auto Dirt bike carrier might even be an okay solution as I’m usually riding solo.