ASAVEA UPDATE 
I tried this out a couple of days ago - on freshly washed and air dried hair. My hair is fine but there's a LOT of it. It's prone to splitting, dry, needs careful treatment. Straightening it with GHDs takes the hairdresser about an hour (longer if I do it myself) and ruins my hair after one or two goes. Ugh. I've had a kerasilk treatment which hasn't completely removed the frizz but has made it way easier to blow dry smooth and style (recommend this, totally life changing). So what I'm after is a way to style my hair that's quick and easy and doesn't damage my hair.
Well, this is certainly quick and easy. It heats up in about 5 minutes, you can vary the temperature. It feels sturdy and well made and came really beautifully presented - in a thick card box, with a velvet pouch inside that you can keep the brush in. So far, so good..
I brushed it fairly quickly through my hair (in sections) as I was in a rush - and it probably took 3-5 minutes to do all of it! It does smooth and straighten, but not poker straight: I don't get the glass-like effect of GHDs or of a really good blow dry. I suspect it doesn't damage in the way of GHDs but over time I'm sure it will cause my hair to split more than a normal round brush blow dry on roughly dried hair would. My hair did stay frizz free over a few days (lasting from Sat until today), but a few waves/kinks crept in today.
The other things to be aware of are:
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The plate where the bristles are embedded gets REALLY hot - I burned my finger (doh, what a nob!).
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The temperature buttons are on the side of the handle - which is v annoying as it's easy to accidentally press them when you're using the brush, and there's no sound or beep to tell you the temp has changed.
I will use it as it's so so quick, but I probably would still do a blow dry with a round brush if I had time (or stick some Velcro rollers in nearly-dry hair if I wanted to avoid heat). It's good to have more options if you're in a rush though. I suspect that the more expensive DAFNI option doesnt really add anything more.