An OVERWHELMING majority of people who DON'T like them either adjusted it so much and so often they never truly got used to it (trying to adjust their way into good scores), they never had it adjusted properly to begin with, or a combination of both. Or they just couldn't live with the aesthetics (I know someone who falls into all 3 categories). That covers 95%+ of those who had a PFS and got rid of it.
If you have no idea where to begin to get it fit to yourself and your shooting style ask someone who does for help or invest the $ to go to a stock fitter, this is not something you'll blindly fall into the correct measurements eventually. If you aren't cognizant of this, and willing to admit to your limitations, you're setting yourself up for near guaranteed failure.
I've been shooting PFSs since 2007. I've tried a few times to go back to a wood stock, and I've finally admitted to myself that unless I'm willing to spend 2-3k to have a custom stock made, the PFS is here to stay.