I bought the H4 bulbs for my medium-range vehicle.
Let's start with the first and most important aspect. Warranty extension to 5 years if you register within (1) month from the day of purchase, on the Philips website and make the declarations.
If you have a CANBUS car that gives you an error for the bulb, you can also get the adapters at a cost of around 30€ for both, which are also Philips, and you've done your job. I got the adapters anyway for the following reasons: You avoid the bulb flickering in potholes and the voltage fluctuation in them, resulting in longer lifespan and no burning out.
In terms of brightness, they are probably the best bulbs I have seen.
I would rank them on par with the gtr ultra series 2.0 and morimoto 2stroke 3.0, and maybe even higher because the ones I mentioned before are excessively powerful and not legal for use as they blind the oncoming driver.
With just this information, you can understand what kind of bulb we are talking about.