Hi, sorry for my late reply :)
I haven't ever used RemObjects compilers.
I've heard about Oxygen (.NET Reflector once had a decompiler for this language), but haven't tried it myself.
It's something like monoTouch but it's completely native!
On iOS, there are no options but to be native, because iOS doesn't allow runtime code generation.
On iPhone, MonoTouch uses ahead-of-time compilation, that's why all the coolness of .NET runtime code
generation (like Reflection.Emit, dynamic methods and LINQ expression compilation) is not available on iPhone.
This is the main reason why Zyan still doesn't support MonoTouch: the approach should be radically different.
By the way, RemObject is not the only vendor providing native (runtimeless) C# support for mobile devices.
has C# to Dex compiler, it produces native Android java packages from C# projects.