The pancake made of durian is very nice. But I wish this place is cheaper because it's pricey for the kind of meals they serve and the ambience.

It may not be the best or most authentic Vietnamese food, but the location is great and its clean and modern. Sure we've had better Pho in Hanoi, but this was still a pretty good rendering of that typical dish. We really enjoyed it.
The service was good and it was a very nice place to stop, rest up in AC and have something to eat after a morning of shopping at the mall at the twin Petronas Towers.
And it sure beats the risk of eating street food if you have a sensitive tourist's stomach.

Malaysian vs. Vietnamese food......Malaysian foods are more attractive, especially you visiting Malaysia.

Du Viet is located in 4th floor of the Petronas Tower (Twins Tower), so-claimed Authentic Vietnamese Restaurant runs by a Vietnamese Chef. They have a very good menu but the foods they serve are not authentic as you can get from any of the Vietnamese restaurant in Vietnam(off-course), LA, SFO, Seattle or Vancouver where a lot of Vietnamese immigrants resides overseas.

I bought my whole family (8people with kids) to try out the Vietnamese restaurant in Kuala Lumpur in one of our visit, it turn out to be a BIG mistake, we should've have spend another meal in Jalan Alor's Hawker center instead, a true expereince of malaysian foods and culture.
We ordered 4 dishes of appetizers, egg rolls: steamed & deep fried, 4 courses of entry : curry, tiger prawns, Vietnamese BBQ platter with steak, chicken chop and vegetables and PHO (Vietnamese Noodle Soup).
here was how a Vietnamese food lover would react to the quality of the foods:
Total Disaster !
1. Tiger Prawns were over cooked, the prawns are stiff like a rock.
2. BBQ Platter: my 12yrs old can do better than that!! the beef was overly cooked and burned.
3. PHO, I'm a PHO fanatic and this is by far my biggest disappointment picking this restaurant. their soup was not close to the taste of an authentic PHO, the noodles weren't typical vietnamese noodles….

their best among the dishes we ordered was the Deep Fried Egg Roll serve with vegetables wraps and viet fish sauce. Which worth to try in this restaurant.

their coffee are vietnamese blended and using Vietnamese signature serving with a filter can. But I would do Starbucks instead on the price that I was paying RM15 for a 100ml serving.

Well, my recommendation: Jalan Alor Hawker Center close to Star Walk or Bintang Road is the choice if you are visiting Kuala Lumpur, better value and much better food while you get to experience the culture.