I bought a set of these on 6 Aug 16 to remove an M12 bolt that had rounded off in the hub of my Jeep. Using an ordinary ratchet, it worked perfectly that day. There was another M12 bolt it wouldn't remove, but I think it might have worked if I had used an impact wrench or if I had been able to seat the socket firmly on the bolt. When an M12 bolt snapped off inside the hub the next week, I used the bolt grip socket on the bare threads of the broken bolt. It worked flawlessly even though some of the threads inside the hub were damaged. The bolt grip isn't perfect, but it's awfully close.
I've used easyouts before, and besides the difficulty of drilling holes in damaged bolts, you run a significant risk of breaking an easyout inside a bolt. Good luck removing that. Moreover, an easyout won't help you with a nut that is rounded off. Before making your life a lot harder, why not give the Irwin bolt grip a try?