I have been using Osram Nightbreaker since 2013. Started with NB Plus, then Unlimited and now first gen Laser (current ones are Laser next gen). H4 bulb on 2006 Myvi.

Used the NB Plus and NB Unlimited for over 2 years. Also I switch on my headlights even during the day so it got a lot of use. If your bulb dies quickly something is wrong with the car's wiring.

Definitely brighter than standard halogen. Tried Philips +30% and it was too dim and too yellow for me. Got used to the NB being brighter and slightly whiter.