Yeah, done it and changed back to Philips Extreme Vision. The LEDs are pretty white if that's what you are after but the output ain't that great. I now have both DRL and Headlights as Extreme Vision.
If you still want to change them it's pretty straight forward. At the back of the headlight there are rubber caps that correspond to each bulb. DRLs is the smaller one. Pop it off, pinch the wee lugs on the bulb holder and it should pop out (can't remember if you need to twist as well?). You then simply swap the bulbs over. Remember not to touch the glass bulb part. LEDs are pretty cheap but as I said the light output ain't that great.