My friends and I had a blast doing a sealed tournament with these. I had a great box, with a Keranos and an Iroas (plus some other good stuff). So much fun that I have bought the Dragon's Maze (yuck) and Dragons of Tarkir prerelease kits too.
If you buy these and then just open up the packs you are doing it wrong. Not only is cracking packs *always* a waste of money, but opening up boosters that are about to rotate seems extra bad. Also, unless you need a bunch of copies of the promo cards and extra spindowns, there are cheaper ways to get packs.