Like what? that they're aerodynamically worse than basically everything out there? or that they don't have any user replaceable parts? or that they're more expensive than everything they compete against?

For the same price you can get something good like a powertap Zipp 101 wheelset, or for less than one of the wheels you can get a handbuilt Hed C2 or Kinlin xr-300 wheelset.

There just isn't any reason (other than thinking they're cool) to buy the Rsys.