It is a legit strategy to change things up... esp. if you are a 4.0+ playing against those below your level. Against equal or better playesr I throw in 65% power with lots of spin just for the way it makes them rethink their return position... then I hit a 130mph 1st serve the next point. It works great.
Honestly, sometimes when I play a pick up doubles game I have trouble returning powderpuff serves at first (usually hitting the net) but I keep at it and by the second service game Im hitting return winners left and right (typical when a 4.5 or so hits with a 3.5). It forces me to stay sharp and forces them to develop a better second serve.
Extreme Eastern BH, Pacific x Feel Pro 95 12.83oz 9pts hl, Head IGPMP 13 oz, 9ptsHL, 1 Max 200g, 1 Becker London Tour