I have a 30yr old RCBS match die set, has the window in the seater, sizer is what appears to be a plain FLS sizer, works fine, also have RCBS neck dies and regular FLS dies. Have Forster FLS Benchrest, bushing/bump, neck and Redding S FLS bushing die sets, and regular Redding die sets. I really can't tell the difference in the finished products out of them, runout is OK on all, Haven't had any issues with having long die bodies from any of them. If Redding is really worth the extra, I can't determine why, at least, not with anything I can see or measure on the finished product, or results downrange. Every mfgr has shipped a bad die here and there, none are exempt from that happening, they'll all replace them if necc., if you get one, you get one, pretty low odds with any of them, send it back, bit of a PITA, but, world will not end over it, in spite of all the hype. Just buy what turns your crank at the time.