The best part about going to club soda was the show we saw. The service was pretty awful - the show wasn't sold out, and yet when we got there (albeit after the first act finished) the coat check refused to check our coats, (even as people left permanently and asked the person running coat check if we could take their spots and also pay). So whatever, we stashed our coats - money saved for us.
Then we got some drinks at the upstairs bar as it was less busy - to be met by an visibly annoyed bartender who was helping one server and maybe one other person with a drink. After paying for the tiniest tequila shots I've ever bought, served to us sans salt or lemon, she also didn't give us back change, and returned after we served ourselves lemon wedges asking if it was okay that she assumed we were giving that change we never saw as a tip.
I know service at venues can be pretty to the point, but this may be some of the worst service I have ever received in Montreal.
Only go if there is an act you want to see. There are so many other, more enjoyable venues in Montreal if you want to check out a random show.