The regular burg is definitely a M&M quality frozen burger. You can see them defrosting on the counter. The more expensive hand made burger is pretty decent and appears to be hand made from ground beef. Everything is flame broiled and basically you're getting a burger you could do up in your backyard. But if you don't have a backyard and live in an apartment/condo that forbids bbqs on your balcony, if you're craving the taste of a backyard burger, Square Boy is your cost effective bet.
The fries are nothing to write home about, I guess. But you can get some taziki sauce on your burger. You can't get that at Harvey's. Prices aren't bad. You get your Harvey's experience for about a $1.50 less. Plus you get some Greek guy chat straight out of SNL's Billy Goat Tavern. They might have Coke, however.
http://www.youtube.com/watch?v=WH_b9XwloHE
Seating is limited. I'm finding the Donlands a very interesting mix of aged bar fly types and "the danforth" hipsters migrating east. Square Boy's patrons seem to represent this confluence. Table over some guy was rocking back and forth with the DTs. At the cash was a guy rocking his Anton Apolo Ohno soul patch for all its worth. The sit down Galaga coin op almost brought tears to my eyes.
Verdict: Harvey's for those who can't afford Harvey's. Go up market and get the home made burger and feel like you have some real meat in your mouth.