Having been a paying x.ai user for 18 months or so now I have to say that Sidekick is a considerable step down, however it has potential to be just as good in time. It seems to do most things you'd expect a virtual assistant to do, and the mobile app looks polished. However given I would very rarely use the mobile app I wish they would put as much effort into the web app.

Currently Sidekick has a number of issues, such as being unable to add my Phone Conference information - I just get a server error.
I cannot seem to add my Phone Number to my profile - Match failed error.
I cannot add any locations as it only lists USA addresses.
Currently there is no Zoom integration but I understand that is coming.

So, based on the fact that the app is rather broken for now, I'm going to keep my x.ai subscription live until Sidekick gets a little closer in the game - 3 stars for now. x.ai has improved dramatically over the last 12 months including adding a Chrome extension, so I only hope Sidekick can put in the same level of investment over time so it doesn't fall behind.