We visited in Sept 2021, shortly after the museum had completed a renovation. To our surprise we…read morespent over two hours going through the displays and the outside reproduction of some of the battleworks; (using the same ticket) we then spent 30 minutes at the nearby uncovered ruins of a Gallo-Roman village. We learned A LOT.
Due to the renovation, handheld tablets and audioguides are no longer offered in the museum. Instead there are several short videos (in French with English and German subtitles) and many static displays (again in French with English and German subtitles). (A visitor to the ruins can use a tablet or a printed guide.)
The short videos provide an excellent overview of the Roman conquest of Gaul, and of the Siege of Alesia.
There is also a section that discusses the use of the Gaullic "image" in past advertising to sell products within France, and how the legacy of Vercingetorix was used during WW2 by both the Vichy French government and by the Resistance.
The design of the museum is in harmony with the subject matter. This includes the top floor, where one can do a 360 degree walk and see the actual battlegrounds of the siege and the position of the Roman camps, the Gaullic relief force, and the besieged town.
(There is a restaurant at the museum. We had lunch there to save time. Food was just ok, coffee (from machine) awful but caffeinated, and service impatient.)