Also http://reactiveui.net/ which looks quite good, but doesn't have good enough documentation for me to commit a project to it yet.

AS a C# programmer, I hope MS can be more focused on Xamarin. Have tried react kind of staff, just can't get into javascript.

As a previous c# programmer, the language is pretty powerful now, it has things now that can make c# look poor in some aspects, but, you get there only through a setup. If you have tried JS with node being installed, npm, webpack, babel and all this stuff, the experience will be poor. Though with these things in check, there's nothing that will pull me back.