At 3.60 a bag? And only 60 in the bag? That's just over one batch. A pound of corn sugar is only a couple bucks and you get several batches out of it, at 3/4 cup per 5 gal. I'll stick to the priming/bottling bucket method.
Just bought a bag of Coopers to prime a twelve pack from a batch (rest went to kegs). The bottles will go to holiday parties with me to share with friends while the kegs sit waiting patiently for me to return.... ! I'll try to post when I have some results. Like others in the post, its my first time using them. I WOULD NOT use them to prime a batch as they are $$$$...3/4 cup of corn sugar or ME is the way to go in that regard.