I have a wired on my MTB and a wireless on my roadie.

Now, on my MTB, the wire is trailed very neatly around the front brake cable, which is all good untill you get crap on it which is every ride, and then it just takes forever to clean off.

On my roadie, as you can see from the pics on the link in my signature, the installation is clean and does not spoil the look of the bike - very important for us roadies!!!

As for functionality, my Flightdeck has all that I need. It has a cadence function which can be set as the main display instead of speed, along with all sorts of other goodies including a lap counter, gear display, momentary display of gear ratios after a shift etc. which are all controlled from the tiny knobbles on the STIs - very handy.

So, I would recommend a wireless Flightdeck for a roadie - doesn't seem to mind getting wet, hot or cold and the batteries last fine too.