The constant-camber guarantee and the removal of a lot of the potential for bunged driveshafts and half-shafts would be a big plus.
The lack of adjustability for the gain rate on the pivot behavior of the rear axle would potentially be a minus, as racers, when allowed, have moveable front upper and lower holes for the four-links they have installed, to change how aggressively the car slams down on the rear axle or refuses to rise on braking, as a side effect.
I see that it has a sway bar and dual shocks, so the usual complaint of ladder bar-type rear suspensions is eliminated: car can't roll on it suspension very easily at all.
It is an interesting setup, to be sure, with a pair of links on the ends that are height-adjustable while the center link is not.
What is a weak point, structurally, is that the lateral movement of the rear end is not limited directly to the axle itself, unless that is hidden, but at some point midway up the large central link, which could lead to bending and misalignment. It does seem strange, in that professional racers and Mazda (RX7 first generation) have used right-to-the-axle Panhard rods and Watts linkages.
It looks functional but complex, and strictly for racing, and that strictly quarter mile, but it being removable, scar-free, would be a big plus.