Originally Posted by jonnythan
Depends on the level. At the lower levels, your opponent is not at all likely to be able to hit a putaway winner on a soft second serve.
Agreed. When I was playing 3.5 early in the season, I had not gotten a decent second serve developed so it was way under paced. My opponents didn't really crush it back and rarely returned a winner on me. Compare that with playing against high 3.5/4.0 people and I quickly realized my second serve needed prompt attention.
I probably have a 50-60% first serve, so I needed a good second obviously.