That's one of my favorite cactus too! It has never flowered for me though.
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Thanks for all the kind comments. It has taken a lot of trial and error to learn how to get my plants to grow well in my conditions and I still have more to learn but I'm glad I'm getting closer.
That is the only cactus that I have that never gives me problems. I can over water it, repot it, give it very little light while overwintering, etc and it does fine. On top of all that it is one of the coolest looking cactus' in my opinion and I never have to worry about getting poked by it. It has never given me any problems flowering. It seems like a week or two after I bring it in for the winter it starts to make flowers and bloom.