Purpose-built tool for one job, and it does that job wonderfully. Has length to spare, but isn't unwieldy. Lets you exert the right amount of force with enough springiness that it doesn't turn into self-mutilation.
If you've ever bought one of those telescoping metal back scratchers shaped like a bear claw for yourself, not as a gag gift, this is the back scratcher that you had hoped for.
Replaced my previous back scratcher, the claw part of a claw hammer (don't laugh; it works in a pinch).