Pixinsight is on my shopping list so I've been schooling up on it. From what I've seen it does a better job than the free tools but obviously it pays to win. The free tools are awesome and do a fantastic job though. Good tutorial by a utuber called 'CUIV the lazy geek' on installing Pixinsight and the tools and add ons. Some of the add ons are paid for like noise and blur exterminator but most are free. He does some great image comparisons between the free and paid for tools.