I've been here a few times on both weekdays and weekends. It's fairly busy during the weekend but I've not had any issues with availability for a party of 2 or 3. Canvas size ranges from small squared ones to big ones at $20+. I only come here with some sort of promotion (buy 1 get 1 half off) which they tend to have fairly often. For the price (especially with discounts) it's a great way to spend a night in Markham as there's not many activities at night around here. It's opened until 11pm and even later on weekends.
I've been here before when it first opened and remember there used to be more resources for painting. For example there were crafty materials and glue guns which enabled you to make a mixed media painting. Now they no longer have any available and it's strictly just painting with regular paintbrushes/sponge/stencils. It's a bit disappointing because it limits the number of cool creative things you can do.
Otherwise, there's a supple amount of supplies, though most paint brushes (probably due to multiple uses) have their tips cut off to an extent where there's hardly anything left on the paintbrush to paint with.
Another thing that's different from when the store first opened is the menu variety. The previous owners (not sure if they still own the stores?) had an extensive menu with hot food like panini and a cool concept with tea where you get to pick and choose different things to put in your tea. Now there's only the regular coffee/latte.