Have visited JJ's a couple of times now with co-workers as this place is super close to our office. Each visit has been just a-ok.
Once was for a holiday lunch which sadly I was just recovering from a nasty bout of food poisoning so I only tried the miso soup and plain steamed rice - both were fine.
Visited last week for a co-workers' going away party. I opted for the Bangkok Pad Thai with tofu and veggies with a miso soup to start. Miso soup was standard, no complaints there. My main arrived hot however it was super heavy as they used a ton of oil so I couldn't finish it. They also seemed to not take much care in chopping the veggies as there were massive (read too big to eat in one bite) chunks of onion throughout. I also could only find two tiny bits of tofu. Oh well!
Would visit again but will try something off of the Japanese portion of the menu instead.