Pros: Good Jeeps; we went as a couple and didn't have to share a Jeep with anyone else; good logistics with guiding, communication, safety, etc.; knowledgeable guides; provided binoculars & snacks.
Cons: NOT a wildlife siting type event; no off roading - just gravel and paved roads; the driver doesn't get to site see very much due to watching the road, the vehicle in front of you, looking for potholes, etc., the passenger gets a lot more site seeing. After Denali Park, this seemed like a tame drive on a gravel road.