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Yeah, I have the IWC version as a front sling mount on my 17S. I have a second for my 16S but it's on standby as I use a S&S Precision Sling Clip instead (side story).
There was a big to-do on FNFORUM.net about the differences between the IWC and PMM mount, mainly regarding the type of hardware used to fasten the mount to the existing sling loops and the material used for the mount.
The PMM mount is aluminum, while the IWC is steel. Given that typical sling swivels have steel ball bearings, there is concern that, over time, would wear the aluminum of the PMM mount, causing potential reliability issues downstream. Since the IWC is steel, this should be less of a concern. Whether or not this is a realistic concern is for others to decide.
Also, the IWC appears to use higher quality fasteners (I think IWC addresses this on their product page), but I am only going off of what is advertised.
I personally think the PMM has a cleaner overall appearance than the IWC but I went with IWC for its steel construction.
I'm not bashing PMM or anything, nor do I want to take a side in the aforementioned debate. As a side note, I think PMM hit a homerun with their replacement side and bottom rails should users wish to go with a KeyMod or M-Lok mounting system. Very slick.
ETA: I'm also a fan of mounts that do not require removing the factory screws. I know a lot of people successfully do so with a heat gun, but that's not something I have wanted to deal with.