I can't compare and contrast as I only own the RCBS and it's the only one I've ever used. It works well and is made well. One bullet is positioned on the return ram--the steel cylinder that slides through the die--and the press arm is brought down to simultaneously size and lube. On the return stroke upward, the finished bullet is pushed by the return ram to its starting position.
What I found is that lubrication seems to work best by giving a turn on the lubricator for each bullet, possibly going 2 or 3 bullets but seldom more. The lube chamber accepts the 'standard' hollow lube cartridge (stick), and pressure is applied to the top end of the stick by a disk that's threaded onto the threaded crank rod. The rod is held in position with a 'C' ring retainer.
So, there's no spring loading or other cushion in this system, and you maintain adequate lubrication by a) adding a short turn to the crank handle, and b) inspecting the finished bullet. After a short while, you get to know the feel of the system, and get to know how much pressure to maintain on the lube stick and how much of a turn is required to maintain it.
When you determine you need another lube stick, you back out the flange/plug on the top end of the lube chamber, and pull out the crank, rod and piston assembly. You then turn the crank while holding the piston until the piston is once again at the top end of the screw, load a cartridge onto the screw, and shove the entire mess back into the chamber. Not fast and not too convenient.
So, while I think it's well worth the price, it could be a bit faster and more convenient.
On a related topic, I started out with a low-temp lube that doesn't require heating. The particular lube I chose ended up all over everything, and each and every cartridge case needed to be wiped off. If I threw the finished bullets in a tupperware, they'd end up with wax everyone.
I bought a lube-sizer heater and went to a heater-required lube. It was a good day. The heater with an electronic temperature controller cost about $100, but has made my lube-sizing life a real joy with no more painstaking cleaning of stuff.
Is it all worth it? Absolutely. Bullets at 4 or 5 cents apiece? You kiddin' me? Fuggetaboutit.