I went from alto to bass, but there were a few months there were my singing range was about an octave. Couldn't hit the higher notes at all. After two years of working on it, the higher notes are now pretty stable and I'm happy with my range.
Quality-wise, I sing in an auditioned jazz group and I've made the auditions every year for three years now. But there are a lot fewer decent male singers. I wouldn't have made the auditions pre-transition.
Dennis