As far as the software goes, I went onto the Cumulus site and found this:
"Cumulus works with the Davis Vantage Pro and Vantage Pro2 weather stations (and the new Vantage Vue)"
I am guessing that means it would be fine to use to upload data?
Yes, Cumulus will definitely work on all Davis VP and Vue stations and it is as simple as filling in a few fields in Cumulus for setup after you have registered with WU to begin uploading. The same simple method for CWOP, PWS Weather, and others.
In considering the Davis and other stations, you generally get what you pay for and there are many happy and satisfied users of all of them. But I would dare to say that there are more upgrades/replacements from other brands to Davis than from Davis to other brands. Perhaps that would be an interesting poll!