I bowled late shift, it's not too bad, except if you're like me, coming from EST, it's 2:30am....make sure you get a nap in that day, or bye bye.
Seriously, the lanes are very playable. I had 610 in doubles (with a poor 165 in game #2, had a bad case of the "tugs"), and 595 in singles (a couple 190s, and 215). Not great by any means, but still decent.Be prepared to move left (probably opposite in you're a lefty) during singles, and get around the ball. If you can execute, you'll be fine. I feel I left some pins out there, but frankly, wasn't accurate enough. Accuracy is the name of the game at Nationals, as there simply isn't enough mistake room to score. Good luck.