I've had one for just under a year and about two months ago kept receiving a 'low battery transmitter' warning on the inside console, I'd had this intermittently since the Spring. I E-mailed Davis Support, completely useless and kept suggesting solutions after I'd explained I'd already tried them, they were very slow in responding where four or five days would elapse before getting a response.
I then contacted the WeatherShop in the UK where I bought it and they asked me to send it back to them. This I did and they've sent me a replacement station and refunded most of the postage. I thought customer service was dead in the UK but was impressed with the weather shop.
I just need to try and work out how to get my weather data into an easy accessible format. I've looked at this 'cumulus' and I find it totally incomprehensible.