I'd like to ask a related question.
What % of American private IR pilots actually use 1-800-WX-BRIEF as their main or only weather source?
I've got a feeling that the percentage is perhaps similar to how many European pilots use AIRMETs, VOLMETs, the UK Met Office faxback service, and some other stuff.
A picture is worth a thousand words, and I could never understand how one can work from a telephone conversation telling you that a cold front is moving into northern Utah or whatever. The phone service is actually very efficient; I just can't see how anybody can use it to get a decent picture - except in places like Arizona where it is CAVOK most days of the year, very obviously so when looking out of the window, and one just needs to get some sort of legal briefing.
I would go for a website (graphical) briefing every time.
The argument put to me for the phone option is that every airport has a telephone, but the battery in your GPRS laptop/PDA might be flat.
What am I missing?