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@nickma
Based on the few test miles undertaken on these wheels, they do spin up fast, and seem to hold speed on the flat better than Open Pro style rims. Apparently they are quite a bit stiffer, even though weight is within 30gms. Quite hard to quantify the real world difference due to the relatively short test ride, and of course the 240s hubs are like butter - not sure what contribution they make to feel.
They are really nice to climb with as well though, being relatively light at 1475 gms (incl. Veloplugs) and feel plush & comfortable. I have not put a massively high tension into the wheels, (120 kgf rear drive side is pretty average for 24 x CX Rays; front spokes at 99 kgf for 20 x CX Rays could go another 10 kgf safely but I prefer to ensure the hub flange isn't unnecessarily stressed and I don't feel any lateral movement so I reckon it's high enough) and this probably helps the plush ride, but the rims are definitely not harsh even if they are classified as stiff. Way smoother and forgiving than Ksyrium SLs. By the way bike forks are Columbus Muscle, which are a little compliant.
IRD Aero and Kinlin XR300 are exactly the same rim, manufactured by Kinlin, same also as French RAR aluminium wheels, some Eastons, and I imagine a few others. Rim depth is 31mm, so intrinsic aero advantage is probably modest compared to a 21mm deep clincher, not forgetting the lower thin-bladed spoke count in combination probably helps.