I've been to Gyubee three times and usually my experience is great, but last Thursday I got food poisoning after eating there.
Their location is a bit difficult to find, underneath a business complex and doesn't have too many parking spots. Their decor is nice, food is pretty good quality, but service can be a hit or miss. There aren't many J-BBQ restaurants in Toronto, and especially because it's all you can eat, it stands out. It's pretty pricey compared to other all you can eat options in the area, but if you compare the quality to other all you can eat BBQs (chako, Korean grill house) it's worth it.
The service can be a bit spotty. I've had amazing servers here that check up every 10 minutes to see how we're doing. Last Thursday there was one specific waitress that kept spilling the liquid from the raw pork belly every time she was serving it to the table (the first time, on my boyfriend's seat, and the second time on the table near the side dishes/water). I'm assuming that's how I got food poisoning.
I want to love this place but they should probably be more careful about cross contamination especially considering there's lots of raw meat involved. I definitely won't be coming back for a while.