I've been to 2 other rock climbing places in Mississauga (are there anymore?) and out of the 3, I would place this second place. It looks like it's a newly built facility strictly for bouldering. Entering the building, the waiting foyer/reception is huge and beyond that you'll see the bouldering walls. The lighting is white and it was very bright. Can't comment much on ventilation here since we came here while it was 30 degrees - sweating buckets! I recommend to sign a waiver online before you arrive; it saves time. Plus the iPad touch pad Is a little weird and isn't as sensitive. There's a change room/washrooms/water fountain and a mini snack bar that offers granola bars and more drinks to quench your thirst. We came in a group of 12 and probably stayed for about 4 hours total. At the very back there is a mini gym. You can prob get a decent work out in too.
Before climbing there is always an orientation and explains the rules for this place. I really enjoyed my time here and I would def come again. Come with a big group!