Responder has 5=4=1=3 shape and the auction goes:
1♣ (1♦) 1♠ (2♦) P (P) ?
What does responder's bid of either 2♥ mean here as compared to a balancing double?
Assume you're playing a standard 2/1 system (as in Bridge World Standard).
Benefits include:
Plus... it's free!