It is true that open reed and bite reed calls require a little more time to get to know, but do not be intimidated by what they write on the package. The Dan Thomplson Red Desert Howler that I bought said nothing about having to be an experienced caller and that is one of the most difficult calls that I have had to learn. Granted, now that I know how to use it, I can make some darn good Yote vocalizations with it.
The trick with open reed calls is getting them in your mouth an practicing with them. I do this driving to and from work. I also watched a randy Anderson video and that helped quite a bit. Once you learn how to use them, you wonder how you ever made it without them.
I have had nothing but productivity out of the Sceery calls and the AP-7 is one of the easier open reed calls to use.