This sunspot measures 129,000 km across, and is apparently the largest sunspot since 1990. If we compare it to the size of the Earth, it's 10 times as big as the Earth's diameter.
Do we have anything to worry about? Not really, the Earth's atmosphere and magnetic field protects us from most of the danger, the only thing the radiation might do is disrupt GPS and radio communications. The only unusual thing about this sunspot is it hasn't yet produced any coronal mass ejections. Only 90% of sunspots produce coronal mass ejections.