When is the last time you changed the strings on you main guitar?
I don't know about you, but I avoid it like going to the Dentist. One of the great things on the PRS with the new tuners is it's actually easy!
I've had the P22 since July and changed strings once until yesterday. When I changed yesterday I realized that I was way past due. Guitar sounded much better - lots more top end and sustain was better.