I bought this as I use a gopro alot of the time for work, normally for time lapses and wides of a shot. This magic arm is great for mounting my camera on my bike and on ledges within a room. Don't think it will last as long as a branded version but that is why its nearly the third of the price of a maffrotto
The reason I've given it 4 stars is because the length advertised is including the additional hot shoe mount (which is about an inch and half). I assumed it would be just the arm itself but otherwise its a great product.