Have used these 3 times thus far and have had horrible attenuation every time. Thought these would be a time saver over making starters with DME, and while they were, it's not worth the cost of stuck fermentations. There are plenty of positive reviews on NB, so maybe variables have changed in my brewing process concurrently to using Fast Pitch unbeknownst to me, but this has crippled my last 3 batches and using Fast Pitch as my starter is the only thing that has changed in the process that I know of.
Needless to say, I won't be using them again and do not recommend them.