I have the acrylic X-out, I don't believe it is as loud as my G-force wood call, but plenty loud and the easiest blowing of the entire line in my opinion. I must admit to a bias here, Heartland is just down the road from me, and I learned to call well with those calls. I call better with them because they are the calls I became confident with and they require quite similar air pressure from one call to the next. The X-out gives a great ringing sound that carries well. That call, in my hands anyway, will not give the truely soft subtle sounds of other calls in the line, but if I need ot coax geese I reach for the Flatliner as a matter of course.
Just my rather biased opinion.