Posting this as a heads up: I took it tonight & it was super glitchy. First it couldn't access the webcam, and then the video froze so many times that I lost track. All their tech support chat could suggest was to "restart the browser & then restart the computer". I did that, & it would work for a while & then freeze again, prompting another restart. I was able to complete it (& was assured that it wouldn't affect my score), but it was pretty frustrating. Given the lack of standardized testing conditions, it doesn't seem like a very objective measurement.
I'd previously done the sample test & systems check, & I used the latest version of Chrome (per the site's suggestion).