I'm in the process of planning my honeymoon to Paris in April. We'd really like to make an attempt to hit most of the major sites (we'll be there for 8 days). I've seen many offers for tours that 'skip-the-line' and claim that they provide a great experience in less time. Has anyone ever used these types of tours (the ones I've seen have been via lonelyplanet)?
While I don't necessary care about paying a bit of a premium for convenience, I also don't want to buy something that isn't worth it. I was considering using them for the Louvre and our day trip to Versailles.