If I stay at an opera-based hotel, I'd get up at 6 and take either the 7a opera bus or 6:45 RER to CDG. The plus is I don't have to "get to the CDG hotel the night before" and I can just enjoy Paris. The downside is I have to get up earlier. Anybody with any thoughts? Price is about the same, given I would probably take cab to CDG hotel (probably holiday inn CDG die to Into the Nights promotion).