Rick put a stiffer rear spring in the shock for my 2012 DL 650, and I was pleased with his work and the increase in suspension performance. He did it for a very reasonable price, too. I do a lot of loaded two-up riding, and the stiffer spring solved a lot of my suspension issues without springing for a new rear shock.
Rick is really helpful; if you have questions about his product, I'm sure he can help you out. He showed me a cutaway model of the rear shock he produces, and it looks like a robust, well built unit.
"No matter where you go, there you are."