I used regular Jif and made a double batch. Flavor is very good. I thought they tasted like crunchy Reese's peanut butter cups. Hubby said they were like Peanut M & M's that you didn't have to chew.
Single batch doesn't make 20. Someone was dreaming when they wrote that number.
Peanut stuff needed much longer in the freezer to be handle-able. I ended up using my smallest disher (like a mini-ice cream scoop) and scooping out the filling into a plate and freezing the balls. That worked much better than the way the recipe instructs.
I will make them again but use proportionally more pretzels to help stiffen the dough.