My first guitar teacher was a big Duncan guy and he had a Custom and JB in his custom made guitars. I bought a Custom for my first guitar (Westone, still have it!) and he installed it in there. It had some crappy plastic covered passives in it before this, and when I played it with the Custom I was like O M G! After that I was hooked. I put a Full Shred in the neck and away I went.
That's pretty much how I started. Over the years I've tried the following Duncan pups in various guitars.
Rio Grande Texas and BBQ
A Pearly Gates neck is waiting to be installed into my Hamer and I'm also going to convert my Custom that I currently have in the bridge to a C8. The journey continues!