As far as KOA campgrounds go, this one was nice.  The sites were close which was no surprise but we didn't spend much time at our site anyway.  There are some RV sites along the creek side that have a lot more space and they also have nice swing benches.  The store is well stocked and the staff is very friendly and helpful.  The showers are private and clean and plenty of hot water.  I didn't use the laundry machines but they look clean and updated.  The location of the campground is perfect.  It is very close to West Yellowstone and the entrance into the park.  You could hear the traffic on the highway but it wasn't too bad.  The campground was quiet at night.  I would stay here again.