I am a die hard Star user, but I tried the Lee sizer when I got some RD molds for my Marlin lever guns.
It took me only a little while to see the advantage of this system, I am not going to sell my Star or even my door stop Lubamatic, but the Lee system gives me other choices. I recently did some 7mm bullets for my 7TCU with the Lee .285 sizer and the liquid Alox. They were really good shooting. I haven't pushed the bullet out beyond 1,600 FPS with the Alox lube, but another day I will try faster speeds.