This super famous Thai restaurant has been called the best Thai restaurant in the country.  I've been here quite a few times and the most important advice I have is to skip the buffet (don't even look at it or you'll be tempted) and order off the Northern Thai menu.  I recently had the Nam Kao Tod as appetizer-crispy rice noodles with some kind of delicious meat mixed in with the noodles.  My entr\u00e9e was Kho Soy  (Steak Tar Tar), which was flavorful and delicious.  My wife had the Kho Soi (Northern Thai egg noodles with Spare Ribs).  This restaurant is consistently delicious and there are many other items I am looking forward to trying on their Northern Thai menu.  The service is always helpful and the prices are reasonable.  My only complaint with Lotus of Siam is they recently quit accepting American Express, which is the only card I like to use in restaurants.  The ambiance is comfortable and inviting, but I've never eaten in the new seating area.  Food-5 stars, Service-4 stars, Ambiance-3 Stars, Value-5 stars.