Nielsen, Comscore, SimilarWeb, HitWise - anyone use any of these web/app traffic-gathering databases?

Greetings Primates,

My company has a limited contract to Nielsen, we primarily use their SuperData for gaming/AR/VR metrics.

We've recently done away with Comscore [for web traffic data metrics, unique visitors, length of visit type of info] for web sites and apps.

We're about to begin a trial of SimilarWeb, which addresses most of what Comscore used to answer for us for web and app traffic.

Curious to see if anybody's company is currently using SimilarWeb and/or if you'd had any direct experiences with them, good, bad or otherwise. Appreciate hearing positive or negative anecdotes about products and services from my fellow tree-climbers that are actively using a product versus my going into a trial or demo with little or no hard data on said product.

Also would appreciate if you've used anything similar to the above for KPIs and other benchmarks for websites, apps or games.

Thanks for reading and thanks in advance!