The ANC on the pros is surprisingly good for earbuds. Would they replace over the ear headphones for say a plane flight? No. But it’s not the easiest to walk around during the day wearing over the ear headphones for routine ANC. The flip side is transparency mode which allows you to be integrated into your environment extremely well, and with conversation boost, can even improve sound quality for those with mild heating loss.
As to fit, I’ve never been able to wear AirPods as my ear anatomy would not hold them in place. The APP were more a trial for me as I expected the same poor fit for my ears. They’re actually stable enough to run in, and for my ears, comfortable for long periods. As to being in ear, I used to wear Etymotics IEM with the triple flange noise isolating tips. Those were in the ear. These rest right are the entrance, not extending in.
Is it worth the 20€? If you want ANC with the transparency function, absolutely. If AirPods in general fit ok, and you don’t care about a little better fit for improved bass, and don’t need the other functionality, it’s not.