I'd really like a way to build in VS (maybe against dummy assemblies or something) and kick it over to my MBP for real compilation and deployment, though. I respect their desire to funnel users through MonoDevelop, but it doesn't step to VS+R#.
Take a look at Mono for Android, for example. It uses a VS plugin instead of MonoDevelop.
It's got a couple of irritating issues (the plugin support is rubbish even now, and it's ridiculously complicated to roll your own), but its just so fast.
My morning at work is: git pull, go get coffee while VS spazzes out for 5 minutes and resharper reindexes everything.
Older machine? Overactive anti-virus or something causing file I/O pain?
I'd pay for MonoTouch like-right-now, even though the project I really want it for isn't near ready for it, if I could write in VS, press a button, and have it build and deploy on my Mac.
(Maybe R# for MonoDevelop? One can dream...)
-Refactoring support isn't great. It's about on par with stock Visual Studio, but stock Visual Studio isn't good compared to VS+R# or IntelliJ. If you're writing "just" an iOS application, I can see this not being a huge deal, but my own use case is bringing over projects for OS X and iOS where I tend to have a lot of code and I'm very used to being able to do massive, contextual refactorings when needed. Can't do that in MonoDevelop.
-It's GTK#, so you have to accept that some stuff just doesn't feel native on a Mac. My mental map of keyboard behaviors no longer properly applies and it's jarring going between it and XCode or IDEA. It's gotten a lot better since I started using it on a Mac, to be sure, but it's not there yet. I compare it here to IDEA, which is also not Mac-native, but manages to feel a lot closer.
Now, one huge, huge plus, that I have to give them a ton of credit for: unlike Visual Studio, MonoDevelop is non-destructive toward project files. This is a power-user beef but a really important one once you get there; if you've hand-edited a csproj, Visual Studio will happily destroy all of your changes (it loads the csproj into an in-memory object model and writes it back out on save). This is infuriating when you have custom stuff in it - something as simple as a wildcard path in a file reference (which is totally fine as per MSBuild rules) will be mashed into a static list of all files at time of invocation. It is super bad, and if MonoDevelop improves some more I might switch to it, even on Windows, solely because of that lack of misfeature.