I think it works well, and I do recommend getting it. Pages load faster, since they don't load much of the bloat and spam, this also helps with security, preventing a lot of code from executing without consent.

It does take a bit of time to customize for all of the sites that are regularly visited. Often time sites load a lot of items, which must be explicitly allowed, then often times when something is allowed, it opens up a lot more items that must also be allowed. Scripts have to be customized for each domain (not each site) to be allowed to run. Which leads me to my next point, and the reason I gave 3 stars instead of 5...

I have spent quite a lot of time getting all of the scripts I like setup, the individual sites and domains configured exactly like I like it. Then something really bad went wrong. On a completely different PC, I logged into my Firefox browser with my Firefox account, and it loaded all of my plugins, and those plugins all reset to their initial default value, not only on the new PC I logged in on, but it reset all of my noscript configuration on my main PC that I've been using for years!!! So much time configuring it exactly like I like it, all gone. It's really quite sad.

Overall, I still recommend getting it, but having lost all of my settings like that is really upsetting. I guess if I would have known this would happen ahead of time, maybe I could have backed up my settings or something, but I had no idea logging into Firefox on a completely different PC would erase all of my noscript settings on my original PC.