It's a genuine part at a good price.
I've see big brand aftermarket front sprockets rattling on the drive shaft due to not fitting properly and would only ever use genuine or OEM.
One oddity was that the chain was supplied with exactly the right number of links but unbroken, meaning it has to be broken, destroying a link, to put it on the bike. The replacement link is included, but I've never seen this before I don't understand why it is done. I can't see anyone removing a swingarm to put an unbroken chain.