I've been using a Facebook Portal for about 1.5 years as an always-on video device. It works great, so I love the idea. There's open water in this space, so it's great to see others entering it.
For now, I don't see why I would ever use this over the Portal. The Portal HW has a high-quality build with a great speaker, and the auto-tracking video is creepy good. I purchased the large desktop Portal for $200 one time—a better deal than 25$ a month IMHO.
I wrote up my remote work experience with the Portal, too (https://medium.com/@dbal/facebook-portal-makes-for-a-better-...). Facebook has been researching business uses cases also. A research firm hired by Facebook came to our remote sites and observed how we used the Portal.