Also no one says why the MEC is so much better it warrants the price besides saying the Lee has plastic in it.
I'm a fan of both presses and can tell you why it's so much better. The mec has an iron base with all other parts being heavy steel. The mec has an adjustable wad rammer with gauge that tells you how much wad pressure is being applied and there is no feel involved.
The final crimp stage is adjustable so that you can turn an imperfect load into a very workable load. The sizemaster comes with an automatic primer feed that truly is an automatic primer feed and it's available as an option for the little jr. You can also use the same shot bottles on the jr. that the sizemaster comes with and it will hold 25 lbs of shot so there is less time wasted filling hoppers.
The sizemaster has the best type of base sizer available and although the jr. uses a ring like the Lee it's attached to the deprime die and the press uses an ejector to eject the shell from the die so either one is faster than the Lee since you have to place and remove the size ring with the Lee by hand.
You can get a universal charge bar for the mec that will cover any powder and shot charge you desire regardless of the alloy in the shot. This is the number one reason i prefer the old sizemaster to the PW 375 and the also the collet sizer. An older mec with steel dies and brass crimp starters with steel wad guide (uses replaceable metal or plastic fingers) is a tank that can't be worn out. The only thing on these older mecs that will wear out is the cam rollers and the collet fingers can be broken if not kept well lubricated. With the Lee you can easily modify any bushings though and get many good loads if the bushings don't give what you're looking for.
Some people find the rotating crimp starters to be a big plus on the mec since a shell can be placed under them without having to worry about which way the folds are facing, but i don't find the non rotating starters to be of a nuisance since when you remove the shell from the wad guide station you just look at it and make sure when you set it under the starter that one of the inward folds of the crimp is facing toward you. It's just as fast as placing the shell under the mec starter.
The Lee load all is a good little press that loads fine ammunition, but it cant make an imperfect load into a very good workable load like the mec can. The load all is a better press for loading slugs than the mec because the slugs can be placed in the wad and then run through the wad guide and the this is not so with the mec as it's a tight fit and the metal rammer will damage the slug. The Lee is a better press for loading new hulls because they come off the press looking like the prettier factory loads, but as with reloads the internal height of the load needs to be ideal for those results. When loading fired hulls with the correct components and height the load all produces loads just as good as the mec and they will look exactly like they did when they were new.
Why is it that people refuse to listen to the voice of experience?
I have experience with both types of presses (sizemaster, jr. LLA) and used both types for many years and there is absolutely nothing wrong with the Lee if it's used correctly.