We spent the day touring Yellostone with Ethan. He was energetic, knowlegeable, and very interesting. We had heavy snow the morning we left and he was on-time and driving a AWD minivan that drove well in the snow. It was also very roomy for just us two. We'd asked to focus on Southern Yellowstone and the area's geology and the hot springs and geysers, which he did. He had snacks in the car ready, if needed, and the included lunch (we selected the sandwiches prior) was also very good and filling.
One complication was that early that morning the park closed the main road leading south toward Old Faithful due to vehicles getting stuck in the snow, We started our tour at 8:30 am and the road ultimately opened by 12 pm when we checked, mid-way through our tour day. That didn't leave much time to head south so we missed Old Faithful. Looking back, it might have been better if, given the conditions and closure happening before we left, the tour would have been postponed a few hours that day to give us more time after the road opened to drive further south. But, admittedly, weather closures are hard to predict and Park personnel never give estimates. But Ethan flexible and earnest when trying to adjust the game plan.
We highly recommend Good Trip and Ethan for your visit to Yellowstone.