Winner

/wi-nər/

1. n. An unexpectedly good situation, program, programmer, or person.
   "So it turned out I could use a lexer generator instead of hand-coding my own pattern recognizer. What a win!"
2. real winner: Often sarcastic, but also used as high praise (see also the note under user).
   "He's a real winner -- never reports a bug til he can duplicate it and send in an example."