For once, the description provided by Viator does NOT do justice to this day trip - it's even better than advertised! Here are the highlights:
First, you see Mt Fuji from many angles, and from far away and up close, throughout the day. It's not a one-shot, drive out, see Fuji, go home things. You see it from afar on the scenic bus ride out to the mountain, you see it up close and majestically at the visitors center, you go to the mountain itself (we made it to stage 5, half way up).
Best of all, the drive to the south to the lake gives many opportunities for viewing Fuji from another perspective, and then the view of Fuji from the top of the "sky tram" near Hakone is breathtaking!
Logistically, everything worked like a charm - all the buses were on time, the tour leader was lively and entertaining, and Viator took us everywhere they said they would, including the ride back on the bullet train.
There is one caveat i'd mention: This trip is heavily weather-dependent! What stage on the mountain you make it to depends on recent snow-fall, and whether you see Fuji at all or not depends on cloud cover.
Our day, December 15, happened to be crystal-clear, sunny, just perfect. Also, as you can see from my pics, going in December mean we got to see i crowned with snow. But had it been cloudy/rainy like the day before, we probably would have seen much less, and if you go in the summer, maybe you don't see the snow-cap Fuji is famous for.
But for us, it was PERFECT and well-worth the $500+ dollars for three people.