While the foods are delicious, I do think that it is a little overpriced. Perhaps because that they make their own Udon?
For example, I got the veggie udon with 3 veggie tempura pieces and it came out to be $17+. When my mom and I got 2 uni cream udon+ one portion of extra uni and some drinks, the bill was $70+. Both time, they were good. But just not $70 good.
There is a new udon place around the spring mountain area as well, that to me gives you more bang for your buck (yelp at your own risk). It is set up more like a Marukame and priced and tastes like one. I don't think I'll be back to udon Monzo anytime soon.