I'd take the $1700 and invest in some high yield securities paying 14% interest. By the time the extended plan kicks in, I'd have another $1700. Question is whether you will get a brake job in the 24 month period of the warranty. I only put about 8K miles a year on. Hopefully I get a brake job in year 4 or 5..... THen the extended is a big waste! Besides, my friend is a mechanic and I would not use BMW for post maintence plan work.
I think the extended plan is a big rip.....
2009 Space Gray Carbon Leather E90 with DCT, Loaded except for that stupid cruise control and moonroof. Mods: AA pulley and air filter. Fabspeed 200 cell cats, Xpipe w/resonators and no secondary cats, Powerchip tune, Eisenmann Sport Mufflers, Xenon interior lights, Vorsteiner Rear Diffuser II, SWS8 subs, JL Audio XD400 bridged 2X200W