Have had and used all four in the past. Prety much use the PeeWee for calling anymore and the standard for howling. (Left my mag at a stand and it was gone when I finally got back there /ubbthreads/images/graemlins/frown.gif )
As far as sound goes, I don't honestly think they're a really good sounding call. In fact, they sound horrendous compared to other calls out there. BUT, and this is a big BUT, they'll call coyotes more than any call out there. Don't know why. Don't know how, but they do. In that sense, they're perfect examples to illustrate that a call may sound one way to us, and another way altogether to the discerning ears of a coyote or bobcat. Therefore, never judge a call solely on how it sounds to you. The final proof is how it performs in the field and whether or not coyotes come a-running. And Crittr-Calls are real performers.