After wanting one since the first test drive back in 2012, I finally bought a 2012 SL in February 2017. Had 12 bars at the time, dropped to 11 about Mid April. Currently showing SOH of 84, with 9 QCs (2 of those were me right after I bought it) and 21xx L1/L2 charges. The car has just over 41k miles. I'm under the battery warranty until October of this year, but don't see any way that I'd hit 8 bars - nor do I really want to try.
We're enjoying it a great deal. So much so that I've influenced a co-worker, a brother-in-law, and a niece to each buy one.
If I had it to do over, I might have held out for a newer one, but this '12 is in such nice condition, and I got such a nice price on it that I'm very happy.
I've learned a lot from reading this forum, and just wanted to say "hello" and "thanks".