I love these spark generators!
I didn't get all the available 2.0 characters yet, but even still...I'm at 44% bonus!
Also if you don't have the Merlin summon disc yet, Toys R Us has them on sale 3 for $10. My local one had a ton of special gold packs. I just went by the UPC code and got Merlin, Stitch surfboard and Hook's ship.