Good work! It makes a MASSIVE difference. Our manual 525i was REALLY easy to stall before they were done, but not after, and that mid range improvement is very obvious (maybe more so in a manual too)
Regarding the 150kms though - at 115 kms, mine were so worn/hard, that the Vanos pistons dropped out under their own weight. Most M54's will have poked seals from much lower mileage/years. Yours have probably been poked for years already.
The original BMW Orings were NOT the correct spec for the environment, and I'd be surprised if they weren't knackered after about 5 years, regardless of mileage. Always worth doing, from what I've seen.