How fun is learning Objective-C?

As a general rule, learning a programming language is not such a big deal for an experienced programmer. It’s just a matter of being the language syntax reference on hand and understanding the language philosophy, such as, object oriented, procedural, structured, logical, event-driven, etc. However, that hasn’t been my case for Objective-C.
Objective-C implements quite a few different concepts if we compare it with C, C++, Visual Basic, Fortran, Cobol, Perl, PHP and so on.
In my first approach to Objective-C over the past few weeks I have to say that it looks like such a powerful language, well thought and mature, but it requires quite a bite of time to become familiar with it. Perhaps I was not ready for it.. and the learning curve has been steeper than expected.
Delegation, message sending and its expressive message syntax have been the toughest things to be understood so far.
So, it’s not fun but very promising instead.. some experience opinion would be appreciated!
Good Tutorials and sample code for a beginner level can be found at:
http://www.lynda.com/home/DisplayCourse.aspx?lpk2=48369
http://www.appsamuck.com/