I agree with Dave completely. The Lee dies give you, to use a pun, more bang for your buck. But he is also right about the lock rings. They are the single most feature of Lee dies I dont like. You can get different ones like RCBS or Hornady lock rings which are much better for just a couple bucks a pair. That or if your handy with tools I suppose you could drill then tap for a locking screw. But the Factory crimp die is well worth the money.
Brian M.