I assumed I never had it because the button never did anything (and I bought CPO but didn't pay extra for SOS). Then I got a letter 3.9 years after buying telling me my service was about to expire. I don't feel like I missed much either way... I usually know where I'm going and what I'm looking for up here in Vermont :/
I also have AAA but haven't ever needed assistance in my E92.
07 328xi coupe SG/Dakota leather, 6-speed manual, sport/premium/cold
02 325Cic vert AW/Montana leather, 5-speed manual, premium/removable hardtop
93 850Ci Oxford Green/Parchment, auto
71 Buick Riviera, 455 V8 land yacht