i do a lot of video rendering - using the first gen samsung xp941, with a read rate of 1180 MB/s and write rate of 870 MB/s, i've seen my file rendering times drop 50-60%, which when you consider some files took as much as 75-85 minutes, is a considerable savings.
Given the 950 Pro 512 GB variant is 2500 MB/s read, and 1500 MB/s on write, i'm really looking forward to it
if you're doing anything with heavy crunching, it's a godsend - otherwise, if not, it might still be worth it as heavy programs like adobe photoshop, that took 30-35 seconds to load from a sata SSD, takes 5-7 seconds.
fwiw