I recieved the same storey about ver. 15.," you don't want it full of bugs" .
I had my car in for emisions recall and had ver. 13.3 loaded.
No problems yet, loaded in one day, thank god after hearing the stories of weeks in the shop for an upgrade.

AM reception seems better, I-Drive loads just a bit quicker, still poor sensitivity on auto wippers,
and slight ruff idle at start up. that's all I noticed on the limited drive home.

No heated seats recall , my 545 is a 06/04 production.

DR.Z