Haven't played the new Wynn machine yet (going at the end of the month) but had the same experience with the old El Cortez 10/40 machine. Hit the 3 sevens and had to play in all of the credits til the last 3 and hit a 40. Not too bad since I only put in $20. However, one night at Bellagio, I hit 3 ovals (2000 coin jackpot) -Hit the cash out button!
It's nice that Wynn put a 10/40 machine in -It's exciting to get a 40 out of a quarter machine.