Are you referring to brand-x or bosch/OEM etcJust make sure to stay away from any aftermarket cam or crank sensors. I have seen first hand of aftermarket sensors causing more problems than they fix. More & more parts making there way from China.
This is somewhat off topic, but I ordered a B-pillar cover for E38 750il on October 7. It was declared NLA in December. Then it showed up on my door step yesterday and check this out: looks like it was black, then has been repainted to beige color. It does look like it came from BMW, i.e. proper stickers and packaging. Production date is in 2003.BMW vs. OEM vs. OE vs. brand-x is an interesting discussion and I would say it varies from part to part. Would you use a BMW air filter over a Mann? BMW belt over Continental? Sometimes good enough is good enough. If in doubt go with the genuine part. I can see how you would never take a chance again after being bitten. Bad enough if you hurt your own car but if you are a professional there is liability...