I have both Redding and Forster competition seating dies.
I prefer the Redding collet neck sizers for neck turned brass. But the Forsters are absolutely solid.
Either way you go, they are extremely good dies. I'm using Redding dies on 300 Win Mag, and got a load to consistently hit between .210 and .255 MOA (measured from center of impact on 10 shot groups). The dies are only part of that equation though; there's an immense amount of other prep work that goes in to that load.
If you are loading plinker ammo or stuff for shorter range 3-gun matches, the competition dies are pretty much a complete waste of money.
If you are shooting out past a couple/few hundred yards, and need tighter groups to hit, they're *part* of the solution.
The dies, in and of themselves, are limited in benefit; you also have to have good reloading practices, *consistent* brass, the right overall length for your particular rifle, etc. That same load I have that gets .210 - .255 MOA, when not fully prepped, averages right about .700 MOA, using the same dies!