Extended Warranty from other than BMW ?

Hello, since my butt was just saved by extended warranty on my other car, I was wondering if any of you have bought extended warranties from any companies besides BMW? I did find a thread about 5/6yr/100k mi for around $2100 or so...

I remember hearing from a few sources that buying extended warranties from outside the manufacturer will be cheaper. Just gotta make sure the company ain't outta business in the next 6-8 years.