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Let's consider 2 things here.
Regarding their regular (not the collet) dies, Lee dies do the same job any others do at a fraction of the cost. I've never had to modify one of them. Plus their decapper rods are a treat; not only do they just slide up and out of the way if you have an overly aggressive military primer or accidentally slip in a Berdan case, but they are far tougher than RCBS decapping rods (which crumple in addition to the pin breaking in these circumstances). In fact on the rare stuck case, with the RCBS dies I have to use a stuck case removal kit; with the Lee dies, just take out the retainer collet and beat on the decapping rod with a sledge hammer. It doesn't hurt the decapper in the least and punches out the case. TRY THAT with RCBS!
Now on to the collet dies. These work on a totally different principle than the standard dies. Every different manufacturer of brass will have slightly different neck thicknesses. The range of neck thicknesses the collet die will work with is fairly tight. Being as I only use these for bolt actions with a set of dedicated cases, I neck turn all my cases to one uniform diameter, and then modify the collet die if need be to size to that diameter. And it's all happiness from there. Unlike standard dies, which are just made to tight tolerances, these are precision instruments, IMHO far more so than any but the most exacting benchrest grade standard dies.
That they can be had for under $50 is a true bargain.