I have not, but in case you haven't seen this thread a few forum members put these on and were happy with them:
http://www.infinitiqx60.org/forum/appearance-body/79865-running-boards.html
Edit: Doh!, seems they are no longer available on Amazon... I wonder if it was due to each package seemingly missing a bolt and the seller having to resend another one out (or the purchaser having to go out and buy it). If I remember, they were about half of the ones in your link, but those do look nice as well.