I've had the xtremes on for about a year now. Bought them at suvlights.com:
suvlights.com PHILIPS- Xtreme Power XP +80%! - (Clear)- H4/9003, H7, 9006/HB4, 9007/HB5, & 900

They are brighter than the Vision Plus I've always had on other cars. In fact, I've got xtreme bulbs in both my lows and my fog. I am quite happy with them, since my focus was more on illuminating power rather than on color aesthetics. To each his/her own.

Sendjjmail, do share how you like them.

Edit: I also wanted to point to this site which I have used to get more tech info on auto lighting:
http://danielsternlighting.com/