I like the lock & load bushings that Hornady uses and they are the same for all if their presses. I do like the roller bearings for the ram, looked really smooth.
The M press does have some design flaws that didn't have to be there, such as the shell holder hold down plate and screws. Don't stick a case and try to use the press to pull it out of the die, it isn't built to handle it, and you can wind up with broken screws to deal with, and a bent plate. Johnny's Reloading Bench put the M press thru it paces and found a few other bugs as well. Not sure if the bearings on the F1 are a good idea or not, only time will tell on those. For the price, it'll compete with the Lee stuff, longevity will take a while to find out about.
