I have the WS-3081, one like this
http://www.ebay.com.au/itm/Solar-Pow...6d13950&_uhb=1
I have it connected to the net most of the time, but just waiting to get everything installed onto a new computer to run 24/7. I use a program called Cumulus, only because the supplied software is rubbish.
http://users.adam.com.au/astroman/new
I also made a new weather shield for the temp and humidity sensor and have it mounted on a pole with the wind sensors 7m above the ground. Works reasonably well.