I noticed this as well last week, and did some searching.
Whether it’s a good deal or not all depends on how well the Magic Link system works scaled down for XC bikes. I’ve never ridden one, but most internet reviews seem to indicate that it works very well and unobtrusively for general riding around.
However, there’s a bikeradar review of the DL (deluxe??) version of the 2+2 that suggests that the Magic Link can engage when trying to bunnyhop. I’m not sure about this as it’s the only review I’ve seen that mentions this, and Kona are still using Magic Link on their enduro bikes (now with air damping instead of a spring). I also spent an hour or so riding with one of their sponsored riders (Karim Amour) who is very particular about his bikes, and seemed to have no problem at all manualing, hopping and flying over and down stuff with ease on a Magic Link AbraCadabra.
Mind you, I notice that Kona are dropping the 2+2 from their line-up this year, so there are no Magic Link bikes in their XC range.
Even given all that, at 50% off you’re basically getting the frame for free (based on a quick tot-up of wheels, forks, shock, groupset and brakes).