Really depends upon the time of year. If it's just after the rainy season, when the roads have only recently become passable, you are likely to be jostled about.In the height of the dry season, they tend to have smoothed out a bit, but then the dust is more of an issue. In either case, the company I went with had good quality vehicles. In addition, we flew out to the Serengeti, which probably helped a bit. The roads did become a bit bumpier the farther north we went into the rift valley.
