the pass got me in with no problems and cut through the lines. A good investment, just plan realistically how many museums you will be seeing. Was useful at Versailles to see the smaller homes of the king and Maria Antoinette and the grand canal located further away from the chateau. Cz of the distance I bought the mini tram ride ticket for 8euros but once I got there my pass just whisked me in while others were paying for entrance.
I definitely recommend the Museum Pass, it worth every spent. The lines to buy tickets are ridiculous, specially considering that you also have to make mandatory security checkup lines We visit many museums and save valuable time and we did not stand under heat or rain.
This was the smartest thing we did-accessed all of the museums we wanted to see and we skipped to the front of the line and inside while others stood outside in very very long lines. We picked the pass up at the Galeries Lafayette at the Tourist Desk and they were just delightful and helpful-it's on the first floor toward the back of the Men's building GF has three separate buildings which most of the guides did not know. Just FYI.