The BMW tool is nice but when I did my E39 (link in 1st page):
- Rent the Adaptor kit from Adv Auto = free.
- I already own a set of spring compressor and use the long bolt for the job.

So it cost me nothing.

However, if I own a shop, then I will definitely buy the BMW tool.

__________________
1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT