For two people, we spent $67 US dollars to get tickets through VIATOR here in the states. So we avoided the long line waiting to get in. Our tour guide (in English) was pleasant but not knowledgeable. He was not schooled in French history and gave us some misinformation. Such as...........Louis XVI's bones are buried here. Or..........."the last time bodies were placed here was just after the French Revolution." We then saw signs telling us there were a number of bodies that were dumped there in 1859.
You can get just as much information (and possibly better information) by doing the tour yourself and reading the signs as you go along. Of course, it does help to know some French, since the inscriptions are in that language.
The only other advantage to having a tour guide is for warnings about watching your step. There are a lot of steps to climb and some uneven ground.
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