I can not vote but would say yes for the better.  My friend and I discussed this very topic the other day.  I do not think that DMT can change you just by itself.  It does not rewire your brain.  It is the experience combined with set and setting that has the effects.  This is true of anything, experiences influence the self. Although the experience idea is obvious I think a lot of it has to do with other factors as well.  The nexus or DMT literature may even also play a large role in these changes.  Expectations and interpretations influence the experience. 

It certainly has showed me that reality is quite complex and that there are things which we can not understand.  Also just the entire illusion of reality and the mind and that EVERY SINGLE ASPECT of ones world view is a chemically controlled construct of the brain.  and the complete power of the brain.  The beauty that can result from chemical stimulation is quite incredible. 

I have also realized many personal thing while under the influence of our dear methylated friend regarding life and my personal interactions with others.  I have taken some positive things away form these experiences.  I learned to be more accepting and caring towards others.  Be more open to others and enjoy your time spent with someone as they can one day disappear.