You may have already seen the Babyliss Hot Big Hair Hot Air doing the rounds on YouTube and I initially thought this Vidal Sassoon styler would work along the same lines. From what I can see from demos of it, they're quite different as this barrel doesn't rotate making it a bit easier to use for hair styling novices or super lazy people like me!
I had visions of creating a Kate Middleton flicky blow dry, but I had to manage my expectations downwards after the first five minutes wrestling with it. It's 1000W so does actually dry hair quite effectively, but I found it much more time consuming that my usual technique of tipping my head upside down and going at it with a normal hairdryer.
If your hair requires a bit more styling effort than this - if you HAVE to blow dry it properly with a big round barrel brush every time, then this is much easier to handle than a brush and blow dryer and you'll only be left with one dead arm rather than two!
This styler would work best on short to mid length hair - I think mine is slightly too long and therefore too heavy to create any meaningful volume. I'd also recommend using it on at least 50% dry hair - unless you have a lot of time to devote to hair styling!
The large attachment - 50mm - is best for drying hair quickly, the smaller 25mm barrel works best for creating flicky curly ends and creates a straight style with more volume that poker straight flat ironing.
Overall it gave me a bit more volume at the crown, but you have to watch how you position the barrel. The ends look much more 'finished' than usual thanks to the ionic generator to eliminate frizz. If you've got silky, smooth hair already that you struggle to volumise I'd stay away from Ionic stylers as they tend to just flatten the hair. I had an iconic hairdryer years ago and chucked it as my hair felt practically greasy after drying it. Thankfully the Vidal Sassoon ionic technology doesn't do this.
The Vidal Sassoon Shine Envy Hot Air Styler* is £39.99 (as of 07/02/2013 it's got £5 off) and exclusive to Argos.