The lee load all is about the best shotgun shell loading system ever made.
It comes with just about every bushing die you'll ever need for powder and shot- for free.
Its $50.
I've used mine endlessly now, and it hasn't quit.
Changeover to 16 and 20 gauge are fairly easy, and cost only $18.
I can make shells as fast or as slow as I want them.
A MEC is great, but a progressive press does NOTHIN, ABSOLUTELY NOTHIN for you if you want to load defensive shells like buckshot or slugs.
Even if you went with a single stage, unless your wrist likes 180* repeated movements, you will be much happier with the one side to the other style Lee at the volume you intend to use it, with the loads you desire to load with it.
Fancy shotbottles and auto bars are nice, but ya can't load buckshot through 'em, or slugs for that matter.
Most of the folks who complain about the loadall really never set it up right, or crimp the shells so damn hard they bend them... its good engineering, but it don't fix stupid.
The other issue comes down to the changeover of powder/ shot , etc. I'd still rather my lee. 95% of my varied load types all use the dsame powder charge anyway...you will find that to be the same eventually if you want to. Dont wanna dispense shot ? DONT PUT SHOT IN IT. Very simple solution. Need to get the bushing out, but dont wanna drain the powder and shot ? Slide a playing card through the slot....again, very simple.
Get the loadall, you will not be disappointed.
If you NEED to load 3k birdshot shells a month, then get a progressive, by all means.
Otherwise, take all that money you'd spend on a mec, and all of their $10 a piece bushings, and buy tons of powder, primer and lead.
BASHERS SUCK- GET A LIFE !