Did a 50+ days tour to Alaska with Adventure Treks out of Grape Vine, TX. We enjoyed the trip a lot especially the assortment of people we travelled with.
This trip could be done for less money on your own but having everything organized for us and travelling with a group, for us, was well worth the price we paid. I felt we likely saw and took part in much more than we would have on our own.
Would we do it again, Absolutely.