I put Nightbreakers into the Aygo and they were definitely worth the change, I also had some LEDs as sidelights for the same reasons as you but they didn't last long - some seem to go forever (ironically the cheapest on ebay) and others will do well to last 3 months.
Just had to change one headlight in Hermann (£30 bulb
) - I should have done both but as each one requires that side of the engine to be removed I decided the other could wait as it was very cold out.
And yes the weather is cr@p isn't it ?