Be aware that, especially in JB, their A grade fresh produce are mainly exported to Singapore because they can fetch much higher prices, even for vegetables from Cameron Highlands. Unless you go to those better Atas restaurants, their regular hawkers are mainly getting only grade B and below raw ingredients. That's also how they can be cheaper.
Also, the varieties are pathetic. For example, their bak chor noodles only have minute amount of minced meats, a few pieces of fish balls and several shreds of vegetables. They also use pork lards, which is unhealthy if consumed frequently. The Singapore's version contains much more ingredients like shreds of dried salted fish, liver, more portion of minced meats and spring onions, etc. Also, the Singapore's version seldom use pork lards.
Similarly, their wanton noodles have much less ingredients as compared to the Singapore's version. Generally, I find that only a handful of those Atas restaurants in JB can offer dishes compatible to Singapore's standards. Even their restaurants of the same name, but their outlets at different locations will have vast differences in quality and taste. For example, their Pekin Restaurant, only the Sutera Mall outlet is acceptable. Their other outlet in Taman Sentosa is a failure.