That's Bravecto. It's.... fine. It's great against fleas for the full 12 weeks but its tick protection tapers off pretty rapidly after the first month. Glad it's working for you but it makes me nervous in this part of the country. It's probably perfectly fine for my mom's dogs back home in KS but we're in tick heaven.
My general theory is that I'm giving something for heartworm prevention every month anyway - I'll just give the Simparica Trio or Negxgard Plus that also effectively takes care of ticks for the full month. Plus, the first of the month is easy to remember - I would definitely forget which month I'm due for a 12-week product.
But different strokes for different folks. If it's working, do whatever your veterinarian says - he/she knows you and your pets better than a stranger on the internet.