Yes it is a genuine Apple product and from my own experience, it's worth the price. I bought a replacement on Amazon that worked. for about 6 months and then just died. Bought the genuine Apple one just this month (June 2018) and it has worked flawlessly from day 1. Do yourself a favor and save up/spend the extra bit of money instead of a "band-aid" fix that will ultimately cost you more in the long run.
All the best!
D