Ate at Teppan Edo for the first time last month. No, they did not take TIW. I am now frustrated at myself for not even asking if they would give a discount for having the AP. I didn't even think of it, so we paid full price for our meal -- and it was pricey, but also tasty.
I would have liked to cancel and go to Bistro, but had already promised my kids we would go before I knew they didn't take TIW, and they were excited, so we went ahead. I doubt we'll do it again.
Generally, I agree with what phonedave and Master Yoda said -- it's not as good as other teppan places. However, I did feel it was probably the healthiest Teppan I'd ever had. They did not go hog-wild on the butter, soy sauce, salt, etc. like others do. Also, the rice was steamed rather than fried.
So, the only recommendation I could give would be if you wanted to have the teppan experience, without so much high-fat, high-calorie food, and you don't mind paying a premium for it.