Many years ago, I did one with Celebrity. I really enjoyed it and would use again. I guess it depends on how much you want to do yourself.
I liked having someone cart me around, and having a meal at the end of the day waiting for me with hotel room figured out. Was it the poshiest? No. Did I have to stress out about anything. No.
Did I give myself enough time to enjoy Denali? Wish we had picked another day.....we did 2 days in Denali, and it just wasn't enough.
So, depends on where you want to spend your money, what you are willing to invest your time in, and what stresses you out.
Good luck!