Just wanted to post a plug for the amazing work of NY luthier Bill Merchant. I recently took a trip to have Bill do some work on my bass and can't believe what a great job he did. He's also a great guy and I learned a lot from chatting with him in just a short amount of time. I now have one of Bill's extensions on my bass. I don't want to get into the whole neck resonance argument, etc. but what I can say is that having the extension on my bass has definitely improved the overall sound and response of the instrument.