Really fun!! I was here for a birthday over the weekend, and although my alcohol intake has warped my memory of the evening, I know that I really enjoyed National Bowl (located in the basement of National on 10th).
The bowling area was super clean & modern, and the shoes are REALLY nice...I legit thought about taking mine home. No stinky, gross shoes here (at least for now!). I wasn't involved with the set up of the bowling shenanigans, but everything seemed to flow smoothly and all of the staff that I interacted with were very helpful and friendly. Unfortunately, National cant control their douchebag population, but I was super impressed with the facilities and the spacious, clean bathrooms. I was disappointed that there wasn't a bigger menu to order from, but the tacos we had were excellent and I don't even think I have to mention how well the drinks went down.
I would definitely consider having a party or birthday here in the future. However, we went upstairs after our bowling was finished and I was NOT impressed. So I'd probably just stick to the bowling area downstairs.