If you want one, get it. I got one last year and loved it. Different blades (serrated, non-serrated), different hardware including grip scales and screws, and a few swag items as well. One thing I will say, I was out of the country for most of December so I didn't get to open it day-by-day, but honestly I feel like it would have been a hassle to do it one step per day for a few of the steps. Some of the steps are finnicky, so I was happy to have to do them all in one go.
Overall though I had a blast building it, and the end result is a very sharp, and sharp-looking blade.