I have had one for a few years. I use mine a ton so the points add up pretty quickly. Plus it has a super interest rate if I ever do leave a balance on it. I used to redeem the points for free oil changes/service but lately have just used it for BMW merchandise/cases of oil/filters, etc. I will say that not all the offerings from BMWNA are the same. The recent offerings/perks don't seem to be as good as they used to.
08 335i Black Sapphire...current
07 335i TiAg...gone
06 330i TiAg...gone
05 ///M3 Imola/Black...gone
04 ///M3 Carbon Black...gone