I've stayed at the Hilton CDG. When not using the Hilton CDG hotel shuttle van to get to/from the Hilton CDG, it involved me taking the landside shuttle train/CDGVAL from the terminal complex and then a walk from the shuttle train drop-off station. I didn't find the Hilton CDG all that convenient, but the transport to use the Hilton CDG (much like the Ibis near it too) was definitely different (and more flexible) than say staying at the Hyatt CDG and having to take the Hyatt CDG shuttle van or a car to get to it. The Sheraton CDG is generally way more convenient for me at CDG than any other hotel around CDG.