What's the difference between Tarva and Fjellse

The frames look similar however, you get what you pay for, and the Fjellse bed frame costs under $100. You pay more for Tarva, and this makes a difference in durability. On the Fjellse bed frame, the slats sit on a wooden ledge. Once warping begins, the slats will start to fall off. The Tarva bed frame has metal ledges. They are better able to offer the support necessary for long-term use.