BMW 1 Series - Xenon headlights on BMW 1 Series - alant01

I'm buying an 05-reg BMW 1 Series with "xenon" headlamps. I suppose this means only the dipped beams are Xenon but the main beams will just be regular halogen bulbs. Is this so?

If so, is it worth fitting high-intensity main beam bulbs, too? (e.g. Osram NightBreaker or Philips Xtreme).

I'd appreciate input from any 1 Series drivers with Xenon experience.