This RV park is hard to rate, because it depends on what you want in Yellowstone. Being new to RV'ing, and going to see the sights instead of other campers, it was perfect. Viewing it as a base station instead of a campground really changed our perception about the parks shortcomings.
We were unhappy with how closely packed the sites were, (trees rubbed our side & couldn't deploy the awning), but the office was extremely helpful in suggesting where to go and the fastest way to get there. They also gave us a refund for the unused night when we left a day early. The spaces will fit up to a 38ft. RV or 5th Wheel and another vehicle - but the maneuvering is tight. We arrived the day after many people left, since school was starting in most of the nation. Our 19yr old came with us, and she had no complaints about the site, but the lack of a fire pit or picnic table would have been more noticeable if we had not prepared casseroles & soups to reheat when we got home every night. Also, bringing those meals (we froze them & packed them in a 6-day cooler with dry ice) saved us a few hundred dollars over the parks 'bill of fare'. We had planned on eating at one of the Lodges, but after driving across the park and walking everywhere, we were to exhausted to go out for dinner. The FB General Store is just up the road and they have a small cafeteria (people I spoke to liked the breakfasts there) and really good coffee and delicious ice cream at the Espresso Bar.
You will need a water regulator (look for one set at 45psi) and secure sewer fittings on both ends to use water and sewer, (they sell them in the office at a reasonable price). If you have a 20psi regulator, you'll want to fill the tank & run your showers off it. Their dump station is on the exit ramp, but we never used it. IMPORTANT NOTE: Bring some planks and supports for your sewer hose because the inlet is 10 inches above the ground. A plastic support WILL NOT WORK! They have a large laundry facility, and the pay showers looked clean and roomier than any coach shower. Unfortunately, they charge $3.25 per shower (I didn't use it, but doesn't appear to be timed showers). Power was stable and the FB gas station has propane for sale (again, had enough of my own).
Forget cell reception here. We got 1X service in Canyon & Mammoth but only Verizon had 3G (EVDO) in Old Faithful while my iPhone only 1X. My wifes T-Mobile phone roamed as soon as we left I-90 and never had service inside the park. All three worked fine on a day trip to Jackson, WY & Gardiner, MT. The office at FB does have an emergency contact number in case family needs to reach you. I was able to get my voicemails within 24 hours as we drove around the park and I could get a signal. My VZW phone had better overall coverage than my iPhone.
This RV park was fine for the week we stayed, although the stench from some of the thermal features does blow over the G Loop at night (stinky!). If you want a roomier site with a fire pit and picnic table and can dry camp, choose Mammoth, Canyon or another site. Read all the reviews to see if this is the right spot for you, and realize this is the only park within Yellowstone with hookups, but was worth it for our family.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC