I took CS106X this quarter and while I enjoyed the lecturer and the assignments, as an "enthusiast", I did not feel challenged. It was more of "let me get some more experience with programming" and not "wow, that's nice to know". The class just teaches some more data structures not covered in CS106A and recursion and touches on inheritance. From what I hear though CS140/143 (os & compilers) seem more interesting to me.
Once I bought the most expensive Vita bundle on Amazon and a day before shipping they included some free stuff with the cheaper bundle (I think it was a Sony decision because other stores did the same). I sent a email to them simply asking why this was the case and they sent me $50 credit with no questions asked.