I've done this twice with my wife as the big event to end our trips. In June 2019 it was just us and another couple which was an amazing experience. We did it again in November 2023 and it was the full complement of 12 which is probably the norm now based on what you are seeing.
Like the regular safari, you are at the mercy of what the animals do that day. On our first trip, we were up close with a group of five giraffes, got to see one sitting down which the guide said is rare, and another run full speed in all its awkward glory past us. On this last trip, it was just a couple that came up to eat but still a nice experience. There is a portion where you stop and talk with one of the cast members who cares for the animals (sample size of two, was giraffes both times, which makes sense) and have a chance to ask them questions as they feed the animals which brings them in closer for a longer period of time than you would normally get with the safari. Though ride the regular safari enough times and you'll have times when the giraffes block the way or I had one time where the rhinos were coming right up to us on a night safari and we had to stop with them walking by the side of the vehicle. Since you are in a smaller vehicle there are some routes that you can take that aren't part of the regular safari and some times when you stop for a bit and have more opportunities for pictures.
Eating at the boma is a nice experience, it is a unique location and it's nice to do a regular run of the safari in the morning and be "we'll be eating there later today" or afterwards, on future runs remembering having been there. I have fond memories of the deconstructed smores desert and the first time we did it with only four of us they were asking us to take as much as we could though on with a full group of twelve it was, take one. Similarly, on our first time, they gave us a set of 4 Savor the Savanna wooden coasters each but with the full group it was just 1 each so I do feel like we were particularly lucky on our first time though this past November we had a better view of the lions from the observation area at the boma.
I think both times we did book as close to the 60 day window as possible, though maybe a little bit later in 2019. There was a bit of a happy dance when we managed to get a spot this last time. It felt like it was something that was more sought after than previously and I was psyching myself up for the bridge crossings on the Wild Africa Trek as a backup plan since it has more time slots.
For our last trip, we were at the parks November 9th - 11th and it was busier than any previous trip. Being in Animal Kingdom on our last day and doing Savor the Savanna as our last park experience of the trip was a moment to breathe, relax. and have a drink in a "happy place" which was one of the highlights of the trip.
