I've used the injection mixture/seasoning in that video previously when frying turkeys and I must say it is pretty tasty. Haven't used it yet on the grill as I have been using the BBQ Pit Boys recipe (
http://bbqpitboys.com/recipes/cajun-smoked-turkey-and-pork-roast#.UremePSIz94) for several of the Turkeys I've grilled this fall which have all received rave reviews, but since it is officially winter perhaps I'll try the store-bought version to usher in the new season! The only thing I'll do differently than the video is go breast down for the first hour, as I think it helps prevent drying out the white meat.