I know that the switch seems looooong and sloooooow but, you do that for a reason. To keep your dog's digestive tract as healthy and happy as possible.
If I were you I wouldn't mess with it, most of those companies just want to take your money and they have no research behind their product (I didn't research this particular one). But the companies that do clinical research use inacurate or biased testing methods which sway results in their favor.
As Jon said, once you have your dogs on a regular, varied diet of meats, bones and organs...there is 0% need for supplements like that.