Personally, I avoid same day expirations since I've only ever lost money on them, and with options, "time is your friend"...
Also, in the event of them going ITM, I don't like the risk of them being exercised.
However, I heard of a trader who bought SPX puts yesterday morning with the DOW already down over 100 points at .10, and sold for $15...blows my mind! Supposedly turned $1000 into $150,000 so there's a basic idea of the risk vs. reward incentive...
JMHO