I am a Manufacturing Engineer here at Hardy Engineering & Mfg. I have tested a large array of the "ST" & "AT" series cutters from the TrueMill Certified collection and have beee able to reduce roughing operations in most cases as much as 60%. I have been cutting a variety of materials including Aluminum, lead Alloy, Stainless steel 303, 304, PH15-5, PH17-4, RAMAX, and 4340 steel 42Rc.
"I've been using the SwiftCarb Ramp and Run ST and AT series for the past year and I haven't found any other endmill that can outperform it. I've tested many other brands and they all fail to run as fast or for as long. Swift tool's regrind shop gives me an endmill that is as good as a new one with a decent turnaround time."
These tools are great and I would recommend that you try them!
Jeff Olberg