The Lee is about the simplist of all the hand helds, but it wears out pretty quickly and parts are almost impossible to get.
The plunger lever is short and if you have Artritis in your thumb joints, working with it can be painful
RCBS makes a good unit, with more leverage but it's quite a bit larger. As mentioned it's over engineered. I have two of them on hand, one for ''small'' diameter primers and one for ''large'' diameter primers. That way it's easy just to change out the Shell head holders. Don't turn it upside down, the primer plunger is free floating.
Lee makes a handy bench mounted model. I have one and it works very well, after I filed off the sharp edges and angles so it would all fit together properly.
I mounted it on a piece of 1/2 inch aluminum plate, so that I didn't have to screw it to the loading bench. It doesn't allow as much ''feel'' when seating the primers, but it's easy on the arthritis.
Another great tool, but again, bench mounted is the RCBS/APS, which is as slick as it gets but uses strips with 25 primers. I've only seen them in boxes containing 40 of these strips. They are refillable, several times and if you're in a rush to prime anywhere from a couple of hundred to a couple of thousand cases, they're very fast, but like the Lee, lack the ''feel'' of seating the primer on the bottom. I was gifted this system and like it.
I don't believe RCBS makes it anymore but I've got over a thousand primers in strips that are full and can easily be refilled.
I've never had the kit for "small" primers, which is to bad, because this unit would be perfect for loading large amounts of 223rem/30carbine or pistol cases.
When/if the gunshows open again, I will be on the look out for some "small" primer strips for this unit. The other parts I can make.
The Frankford Arsenal hand held primer is the Cadilac of all the units.
It's very smooth, fits nicely in the hand and has lots of leverage.
The bad, it takes proprietary shell head holders which, like the unit are expensive. Non standard or obsolete shell head holders have to be custom made.
They offer a kit from the US, which costs $250 plus shipping etc.
I used one of the FFA units, that belonged to a freind. It was very nice to use. Is likely the most tedious of all the units to set up and requires removing four screws to change out the shell holder and primer ram pin.
The primer ram pin is adjustable so that all primers are seated identically.
I didn't like the Hornady or Lyman hand tools. Got rid of them both very shortly after purcase.
K&M is a lovely little unit but it's a one primer put into the seater, by hand, every time. Fine for anyone not loading more than 20 cartridges at a time.