The cheesecake is nothing to be crazy about but if you haven't had it, I'd recommend trying it. It's different from any cheesecake you will eat!
There are three kinds: original, green tea and angel. I've only had original and angel, they are similar in taste. Angel is softer if anything.
I personally enjoy their madeleines over their cheesecake. It's smaller and the flavours are somewhat similar.
In regards to lines, you shouldn't need to wait long. If you always encounter a long line at this location, I recommend going to the one inside Union Station near the Go Train waiting area. There is never a line as long as you are not there during work rush hours. The only thing is I beleive they only serve the original cheesecake.