It works. Took three goes to get it going one has to explicitly turn on the 'continue on phone ' app in the share menu. and then a couple of tries and it shares the website ( didn't try anything else) to my insider pC.
BUT...it shares to Edge not to the default browser which I consider a bug.
I will download Chrome to my phone and see what happens. I'll try to continue a mail message and see where it ends up...probably not in Thunderbird .
So for me, so far, not very useful. MS say it will work from an Ipad... I try it and again it takes two or three tries once one has downloaded the app.
On both the phone and the Ipad it is very slow to get started and asks for now or later and then asks for the destination...which is silly as there is only one Insider PC destination here.
Mail on the phone or ipad has no sharing icon neither can one share/send a picture from the camera roll or the saved photos
So far not useful at all.