I have ordered mine for my RSM 400, but I am a quite annoyed. I think 2 modules are insufficient, so I have ordered a 3rd one, which I have to pay € 430 ($ 490).
For 3 modules that means I have to pay € 1,455 ($ 1,657), which is even more expansive than the 3 module kit for the RSM 500 here in...