I disagree. The core write-your-code experience is full of jank, to the point where I have wondered in the past whether the XS folks develop it in XS. Its smart indentation isn't smart (randomly indenting another three levels, not being smart enough to stick to the indent level I pick when I backspace to where I want it--next line, back out there again!) and occasionally the text widget will "lose" a line of text and take a few seconds to remember that it actually exists.
The Xamarin toolchain has steadily improved and its PCL support makes a lot of things a lot easier, but I can't envision a use case where I would want to do my development in their IDE. I keep a Windows machine just to have VS so I can do the 90% case there and suffer through the 10% in XS.
The line issue pops up for me in regular control for blocks and I'm using the most recent beta (which I'm uncomfortable doing but had to do to get anywhere). My indenting still gets very confused anywhere I have #if blocks.
You know I like you guys, I loved doing GSoC with Mono and I wouldn't have interviewed over there if i didn't like what you're trying to do, but these issues make it really hard recommend Xamarin. Having my IDE make me legitimately mad is a bummer.
The only thing that I'm really missing is Resharper. For other things XS is very similar to VS. Remember that the cost is $300 for each platform, so you have to spend $600.
The Xamarin toolchain has steadily improved and its PCL support makes a lot of things a lot easier, but I can't envision a use case where I would want to do my development in their IDE. I keep a Windows machine just to have VS so I can do the 90% case there and suffer through the 10% in XS.