Poised on the brink of buying the ghd Air after reading so many great reviews, but eek it's expensive gulp Sorely tempted though, having seen how great my hair always looks when I've been to the hairdresser, who uses a ghd hairdryer. My question isn't really about the Air (though opinions would be helpful there too!), it's more about whether it's worth my purchasing the set that includes a diffuser (or indeed any hairdryer that has a diffuser, if I decide I can't justify the ghd).
I've always been a bit shit at drying my hair, tbh - tend to just blast the dryer at my hair any old how, and unsurprisingly end up with a disappointing amount of frizz. Currently I tend to avoid blow drying whenever possible - I scrunch a bit of product into my longish hair after washing and shape it with my fingers so my natural curl comes out, then (time permitting) let it dry naturally into a 'beachy waves' sort of effect. Trouble is that every time I do this and then blast it with the dryer, I end up with a 'frizzy beachy waves' effect. :-( (Not quite 'Monica from Friends when she want to Barbados' but heading in that general direction. 
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I gather from reading around the web that a diffuser is what I need for drying my hair if I want this look, but although I've seen hairdressers use them a time or two, I've not really got any experience with them myself. So my question is: are they worth it? Thanks in advance...