Yes, definitely worth learning construct 99.x
They will have the same sort of event system and logic.
C2 will be more stable and extensible
Also, its still possible to make something in c1. Its just quirky, not broken. Also, some bugs will still be fixed and features added by the community, as ashleys begun opening the svn to other users. Id recommend using c1, and testing c2 along with the rest of us until its ready
And welcome to scirra