I have purchased it, and can say, it is definitely worth it. It includes several C2 and C3 plugins.
That is very surprising I believe the author has stopped being active before Construct 3 was released, years ago.
Those addons have likely not been updated for years which cannot make them worth it in regards to Construct 2 or Construct 3 and their newer releases.
Especially considering the recent changes made to Construct 3 addons support.