We are using SN100C in both our wave and selective machines and have very good results. We also using it for ROHS hand soldering. It flows better than SAC305, the joints are shinny just like Sn63/37. We are looking into using SN100C as our paste but we can not find a vendor who will put SN100C into the cartridges for our MY-500 Jet Paste Printer. We have never had a customer complant with the SN100C joints, in fact they loke the way they look.