I'd change the sheath, this compact knife deservers an equally compact sheath that holds the knife better. I went with a custom sheath that's perfect, by Mike Sastre.
For me, the Street Beat is close to perfect. However, add me to the anti-Kydex camp. Just one caution, the KSF sheath I used did not have a welt to protect the stitching. Street Beat is mighty sharp...it cut the stitching. Anyway, that knife deserves a custom sheath.
Only two things - the sheath and the hole in the blade. I think going back to old style Spyderco fixed blades without the hole would make them much more dependable without any downsides.