There are times when items you purchase are not what they seem and I want to check this out before going forward with a wireless computer purchase. It may say "wireless," but that does not mean it will be a simple installation. I have been looking at the wireless computers and wanted to know how easy or complicated these items are to install. The one I am looking at is the CatEye CD300 Double Wireless as well as the Shimano Flight Deck. Also, even though it is "wireless," what are the components that need to be installed. Any info on this subject would be greatly appreciated.

Also, is there a preference to CatEye or Shimano as far as bike computer? Thanks.