I will jump on the RealShelby bandwagon too.
First, Terry is quite helpful and appearently VERY patient. He answered every question I had and gave me all the options for the modification. Interestingly, he didn't try to sell me either the basket or him doing the work, just provided information.
I choose a "Werks" (I think that's what he called it) basket with the new style shims and bushing from Terry and had my local mechanic do the installation.
The bike is smoother, quieter, and overall more enjoyable to ride.
I am quite satisfied with the mod, for me it was an excellent investment.