I got a q-jet carb from them and it was nicely done. If you are concerned about correct gold finish, I don't think they do that process.
You can also ask for different jetting from stock if your application is different. Your core will have to be rebuildable to get credit. They have a year guarantee. The carb is painted at the screws so if you open it, the warranty expires. I'm not sure you can get the same unit back, so be sure to ask it that concerns you.