I also came from NoScript. It took some time to get used to uMatrix and whenever I click a new site I often have to do one or few changes. But this happened with NoScript (the old version) as well. Now that I'm used to uMatrix I prefer it over the old NoScript. It's more powerful and also replaces some other extensions as well. I hope that NoScript will soon be back to its former self but for me, I will stay with uMatrix from now on.