If you like gyu-don things then I think you'll like this place. It's not somewhere you'd take a date haha, but it's good when you're just grabbing lunch or something. you'll be really full (or at least i was) for less than 1000 yen and i think that everything was pretty tasty. You can choose the size for the rice and the meat, and get a set or just gyu-don. They also have stuff that isn't gyu-don... like beef seasoned in other ways or kimchi or ... lots of stuff.
Just like any other fast food-esque gyu-don joint, it can be REALLY packed sometimes. These times are usually the times that you want to eat the most (lunch time, after work, etc) but if that doesn't bother you then go for it!
There's a saying, “a donkey dressed in silk is still just a donkey dressed in silk.” A quick lunch is a quick lunch. Bear that in mind when you head to Sukiya. It's not bad, but it's pretty average. They have a very normal counter and table set up, that feels microscopic when it's packed with people during the lunch rush. They do have a few things going for them. First, the menu has an incredible variety. I had a lunch set with eggplant mappo donburi. It was tasty; probably the best fast food that I've ever eaten. Being fast food, it was also cheep: 480 yen. Second, the calorie content of each dish is noted on the menu. That being said, it's a place best visited when you're in a hurry or on your own.
Sukiya, a Tokyo fast food chain, is not quite as common as Yoshinoya or Matsuya, but it is superior in my opinion. Flexibility is what sold me. There are countless rice bowls to choose from: traditional gyu-don, unagi don, roasted eggplant, even a "Brazilian" style that incorporates a spicy tomato sauce. Everything is neatly laid on on a huge picture menu, so you can just point to whatever you want. You can order most bowls in a set meal (with soup, salad or whatever) or a la carte. Also, the meat portions come in three different sizes, so you can tailor your meal to how hungry you are that day. What a brilliant idea.
I tried the traditional gyu-don, which is inexpensive beef and simmered onions. It wasn't incredible, but definitely higher quality that the other gyu-don restaurants. My set meal cost about 850 yen.
Sukiya isn't quite fast food - it takes 5-10 minutes for your rice bowl to come out. I went to the Ikebukuro location, which was packed with hungry college students from nearby Rikkyu University.