wheel

Been looking around for wheels. Found a cracking deal on a set similar to what I was after. They come with Ceramic bearings. How well would these stand up to using this though Winter? Are they worth the extra cash and potential handle?

hey guys/lassies my mtb has been giving me a bit of flack on its wheel hubs for a while, what size bearings should i be looking for to replace them? front wheel is really annoying me and some of the bearings have a dull couloring on spots instead of been shiny. its the old black/grey/orange...