I've used a standard in 243 and a micrometer head version in 308, both are excellent.
Remember these dies do their best with good brass that has been sized straight. They're great tools but they don't cure ills that occur earlier in the loading process.
fwiw,
I can't agree more with the above... You can seat the perfect bullet with the World's Finest Sliding Chamber Seating die in brass that has had the neck pulled out of round and get anything but Runout or TIR...
I have 20 sets of Forster Ultra Dies and Love the Seater, however, I do not care for the sizing dies. Their decapping and expander ball will induce TIR. I simply buy a Redding Standard Die or a Redding S Type Die with Ti Bushing and replace the expander ball with a Redding Carbide Expander Ball. With prudent use you can stay under .0015" TIR. Get a runout gauge if you don't have one. I use a Sinclair with a Swiss Compaq .0005" indicator...fwiw
Regards, Matt Garrett
757-581-6270