It's definitely neat and the UX is kinda slick... I tried it last weekend. Unfortunately, even basic usage seemed to fail. Launching Edge browser would create a window that was frozen, and no apparent way to recover.. closing left the outline in place, and there were issues with the integration itself. Trying to connect the "Desktop" option seemed to freeze. I was able to connect to the session via the integrated web view, it looked to be asking to allow the rdp connection.
I really didn't dig in any deeper than that... didn't match the use case my SO needed, so wound up having to revert back to Windows on her laptop.
I do hope it gets better... maybe with some more app/system integration on the Windows side of things.
What's her use case, if you don't mind me asking? Because a lot of Windows apps do work fine in Wine (some may require additional tweaks), so perhaps that could be an option.