Warranties for used 2001 325i

Hello Bimmers,
I recently purchased a really clean 2001 325i from a non BMW dealership so my expectations of them doing any maintenance are very low. However, I know in the future there are going to be normal wear and tear items that I'll have to cover. I also purchased a 2 year warranty on the drive train from the dealership which is extremely limited but a warranty none the less. I wanted to ask if anyone has found value in purchasing a used car extended warranty from the BMW dealership. If so, how much was it and have you experienced any problem trying to use it?

Thanks,

325idegrees