Some of the Leepresses including the challenger are not overly strong and the linkages will eventuallybreak if you do a great deal of sizing of larger cases.
I keep hearing that and it may very well be true, but I have had a challenger for 12 years and loaded up to and including 300 Win Mag with it and it's still going strong. I don't use it as much anymore since I was given a Herter's press, but it still gets used for the 45-70. I am sure there are better presses out there, but for the money it's hard to beat. If mine broke today I would have gotten my moneys worth out of it many times over.