heres my take on it. If you break one in your 7mm mag lee dies your only choice is to either grab one out of another 7mm set of dies or buy a new one. I don't care for rcbs changing spindle sizes either but break one and give them a call and youll have a replacement in 3 or 4 days for free and they will do that even if your die set was made in the 60s. As for lees unbreakable claim. Ive managed to break a few. Load progressively and it WILL happen. Add to that that most times its the pin that breaks not the spindle. Rcbs will even send you a pack of replacement pins for free and 5 minutes later your back to work (but I will say why do they need to have two different sized pins) . Break a lee pin and the whole spindle is trash. I will admit that even lee has sent me stuff for free. but it seems like its pot luck depending on who picks up the phone that day. All that said I have nothing against lee dies. I use a lot of them. Its one of the products they make that is actually a good quality piece at a good price. Not even anything plastic on them.