I usually keep mine at 60fps (since it's the max refresh rate of my monitor). So far, results are sorta mixed: I've seen benefits in games like The Forest, which ended up silky smooth, but had to jack down the motion blur because it was giving me a bit of motion sickness, but with something like MGSV: Ground Zeroes, I still see frame hiccups still occuring post Omega 14.12. On The Talos Principle though, it was a completely smooth 58fps average using the benchmark (first few dropped/loading frames perhaps made the score lower than 60fps but I ain't finicky). So I guess there's still some tweaking to do.
Ground Zeroes has a hard 60fps lock that can't be turned off so it could be conflicting with the driver level cap.