As a meteorologist and general weather nut, the truth is that there are 3 categories of weather station.
You have ALL of the box store type stations grouped into one category. Ambient, Oregon Scientific, Accurite, all of them. Doesn't matter if they're $50 or $250. They all use the same grade of sensors, communications, and power type. Your temp readings will be inaccurate on sunny days or if you mount it too close to the house. Your wind readings will be too low because you can't mount the anemometer separately. You'll likely need to change batteries often. Transmission range will be weak. And you will be very lucky to get 5 years of service out of the unit.
Then you have Davis Instruments. Their Vantage Pro 2 system is a huge upgrade. Typically $500 and up depending on options but WELL worth it. High quality temp/hum sensors. Fan aspiration to keep readings spot on even in summer heat. Very long transmission range. Batteries last years. Tons of upgrades and options (soil moisture, UV sensors, radio repeaters, mesh systems together, etc.). These stations will also last 20+ years. The performance will be very very close to official mesonet sites.
Then you've got scientific grade/official stations. These are the ones universities use, as well as government agencies like NWS, etc. You're talking way out of budget for a home owner. Not to mention station maintenance costs.
I personally rock the Davis VP2 with 24 hour FARS and LOVE it.