I've developed 70 programs in Real Studio for use in the classroom and labs for my courses. Many of these programs would not have been possible at all without the MBS plugins. Even though the plugins are amazingly comprehensive in adding core Cocoa and Carbon API access with thousand of methods, the developer has done a superhuman job of continuously adding even more functionality with each release. If you want to develop complex software with Real Studio, you MUST purchase these plugins.
By the way, before the typical troll on MacUpdate accuses me of being an amateur for using Real Studio, I've developed research software in assembly, C++, LabVIEW, Java and Objective-C, to name a few programming languages, on laboratory minicomputers and personal computers. I've worked as a research and programming consultant for several companies. My software is used throughout the world. I choose the appropriate tool for the particular job, and for my educational software, Real Studio and the MBS plugins allowed me to create professional applications. So yes, despite your trolling, Real Software can produce sophisticated applications.