Finally got around to trying this place. My wife is Thai, and we always enter Thai restaurants with trepidation because they usually disappoint. I think Yhuppa's is a step above a lot of Thai restaurants, but it was a mixed experience for us.
First, the fish cakes were fantastic, among the best I've had. Tender and flavorful even without the delicious shallot relish. We both loved them. The duck salad was also nice: tart and fresh with salty duck.
The green curry is the standard green curry you expect from Thai restaurants: canned coconut milk with commerical green paste. This kind of green curry is too heavy (it should be closer to a soup than a chowder) and it doesn't have lovely globs of fat on the surface from frying the curry paste in the cracked coconut fat. It completely lacks the fresh, vibrant punch of a good green curry. But for $10 it does the job. My wife's complaint is that it was loaded with bell peppers and wasn't finished with Thai basil. (They used bell peppers in three of the four dishes we ordered. It's not just not authentic -- it completely changes the nature of the dish.)
The big disappointment was the pad gra pow. Or at least that's what they call it on the menu. But it isn't pad gra pow. It's a bell pepper and oyster sauce stir fry. Pad gra pow should be a stir fry of meat, garlic, chilies, basil, fish sauce, and maybe, optionally, a bit of oyster sauce for color and salt (the traditional recipe leaves it out). It's simple and delicious, and it happens to be my favorite Thai dish. At Yhupa's, I got a hint of basil, but the oyster sauce and bell peppers overwhelmed the dish. I'm not saying it was a bad dish, it just wasn't pad gra pow. (Thai Rama in Chandler does a good pad gra pow, and they don't bat an eye when you order it with a soft fried egg.)

- Fish cakes - Todd Mun

- Duck salad - Yum Ped

- Green curry

- "Pad gra pow" - sort of
Kissing don't last; cookery do.