I was dubious about getting this as there were some reviews saying that the adaptor was not an original Apple one and was instead a poor quality rip off. However, there seemed to be enough reviews to the contrary that I decided to take the risk assuming I could return it if it wasnt as advertised.
Glad that I did, as to my eye it looked like a brand new Apple power adaptor. It certainly looks identical to my old one except that it runs noticably cooler and it has the new mag connector.
I bought this item from CHARGER4U, so bear that in mind when you are reading the reviews, they may be of the same alledged item, but they are not of the same seller. CHARGER4U have sold what they advertised, a genuine Apple maglock power adaptor and my macbook is working fine once more (better than it was to be honest as its cooler).
So, as a sceptical buyer, I'd recommend this to anyone who is currently doing what I was a month ago... reading about all the varying varieties of charger and possible suppliers and wondering which was legit.