I recommend the Lee U-die. When I first bought my Dillon 650 I shot Limited and had to chamber check every round because too many (~10%) Glock bulged rounds were getting through. I bought and have a Redding GRX die on a single stage press and while it works great it adds another step and time to the reloading process. A friend and multi-division GM recommended the U-die and I no longer chamber check any rounds and have had 0% bulged rounds get through. The U-die does slow the 650 down just a hair, but it eliminates the chamber check and the added GRX step.
I've added U-dies to all the calibers I reload and have >30k rounds loaded with no bulge problems. Note ~10k are 38SC and the U-die eliminates any bulges there too.
Shoot straight!