Its a must to use skip the line option as you get in quicker. We met beside the Louvre with our guide and we had headsets so we could hear her, she gave alot of detail to the various works of art.
When inside it was very crowded. I took my 12 year old son and he got bored with it and we had to leave. Try to do this tour in the morning when you are not too tired as there is alot of walking.