Perfect for weather underground
Short version: buy it, download WUHU, upload to your favorite site in record time.

I won't spend a ton of time reaffirming what other reviews have said about the hardware. I've been very impressed in the 2 months I've owned it. So long as you site the sensors properly you will get great results. Having only one set of batteries to replace (2 AA that last about 12 months) was a welcome surprise. Updates every 8 seconds in wired mode is outstanding.

I bought this so I could post data to Weather Underground and was a little confused by the software that came in the box. It's actually very nice, but I'd recommend skipping it and just download WUHU for FREE. I'd provide the URL to get WUHU but that's against guidelines. Not too hard to find though.

WUHU used to require that you install the software that came in the box first. Now it doesn't, it can pull directly from the base station through the serial port. It truly was plug and play for me. No drivers to load, just WUHU. WUHU supports rapid fire updates (for wired mode) and uploads to most/all the other popular online weather sites too.

I was a little worried by reports of inaccurate sensors (anemometer etc.) on other review sites for similar models (WS-2315 etc.), but mine have been bang on and remarkably sensitive.

Full disclosure of negatives:
-The temp sensor is not shielded. If the only location you can place the temp sensor is in sunlight buy a different system. Or either buy (for about 35) or build a shield.
-I couldn't get the wires to extend with my old phone line coupler, I had to buy a new one for a few bucks. Well maybe that's a positive since RJ-11 wires are so easily found.
-If you don't have an older box with a serial port lying around you'll need to buy either a usb serial adapter or a serial card.
-My wife and friends look at me really weird when I want to talk about why weather stations are so cool. Several will be getting this for Christmas...

Great Weather Station
This is a great weather station, it gives a lot of great informtion, the only negative issue is the screen. it can be hard to see at times, unless you are right on top of it.

No so good experience
The sales literature tells you 330' of wireless. That is if you keep your computer outside or put the outdoor sensors in the house. Going thru one wall my reception was a maximum 15 feet.

I talked to the customer service twice; both times they were extremely rude. One lady told me when comparing this product to a cordless phone she told me that my 900MHz cordless phone uses satellites so it is not a fair comparison. Another lady told me not to user regular phone cables to extend the sensors. The manual specifically states to use regular phone cables. Still haven't got the wind sensor to work because of this issue. When I questioned her about the discrepancy between the manual and what she was telling me she was rude and insistent that I was stupid. I finally gave up looking for help from them.

I believe I will get this working and it will work the way I want it to, but no thanks to the company's customer service as it sucks!

Easy to install & works great
The unit was very easy to install and everything worked great the first time. The instructions for using the many functions of the unit could be better written. Highly recommended for the price.

Really great weather station
We actually bought this exact same model at Costco, now they don't sell them there anymore so got this one for our Son-in-law at Amazon. It is wonderful. You can get a readout of rainfall,wind speed and direction, indoor,outdoor temp, Barometric pressure and more. The visuals are great and it's really simple to install. We put ours on a pole that we attached to the end of our workshed roof. It transmits wirelessly to the monitor inside the house or you can connect it to your computer (we did notdo that). For the price it's a wonderful gadget, better that news media since it tells YOUR weather.