Well, I don't think that's what a portable lightweight bluetooth keyboard is for. It's very comfortable to type on, is fairly durable, and is quite light and reasonably small. It's not meant to replace a full keyboard, just to be a decent substitute.
That said, once I did the ctrl/caps remapping I've used that keyboard extensively with emacs and only occasionally did I feel any real limitations.
Except it's what came with my full-size 27'' beast of an iMac. That sort of thing should come with a full keyboard or something that's supposed to be a substitute for it.
If I'd gotten it with a laptop purchase, then yeah, I wouldn't be complaining. It would be pretty cool for that.
It works fine with Vim, but not XCode or Visual Studio, which are my two primary uses for the iMac purchase.
That said, once I did the ctrl/caps remapping I've used that keyboard extensively with emacs and only occasionally did I feel any real limitations.