We are using Farrar frames but we also have some Langstroth frames.
We buy the hives in parts, then glue them together and paint them ourselves. They are easier to transport like that and cheaper to buy.
In the picture from top to bottom:
lid; food tray (holds a sugar solution for winter feeding); farrar box; langstroth box; base (which is aerated with a central piece of mesh).
Honey paw frames.