How would you compare the sounds of a HB, SCHB, and JA-15? They all sound great on clips, but to my ears the JA-15 sounds closest to a traditional jazz box, while the others kind of split the difference. And while the piezo option on the HB's is cool, it's not essential for me. Additionally, what was recent change in the construction of newer HB's (the internal block??), and how did it effect their sound? As with so many from PRS, they're all so damn appealing.