If you want to get semi-dressed up to go to an underground ping-pong bar, Spin is where you might want to show your face. You don't have to dress up in your Sunday best but dressing up (not just for Spin but also the surrounding bars and restaurants) might help you fit in a little better.
My cousins and I didn't because we didn't give two shits about hooking up with anyone there. So we ordered our beers, played a few rounds of expensive ping-pong, then walked out down the street to another bar that fit our personalities a little more (i.e. Horseshoe Tavern and Odd Seoul).
Good place to bring a date and lose (on purpose) or for a group of office buddies to come down to relax and have fun. I may or may not come back here if I were in Toronto if I remember to bring nicer clothes.
Oh yeah, beers are expensive here. So is the ping-pong time. If you're only interested in playing ping-pong, you might be better off finding a Chinese friend who might have one in their basement.
Parking: Limited paid street parking
Price: $$
Wait: None for drinks, reserve tables in advance or wait a long, long time