The machine itself has quite a lot of flaws. It lacks resistance at varying points in both the bicep curls and tricep extensions. It’s hard to design it well though bc single lever systems will always be flawed to some extent. Without making the design more complicated it would be challenging but not impossible to fix. The tricep functionality is almost nonexistent so I don’t really use it for that. It doesn’t feel amazing but the bicep curl does a decent job. The material itself is great and durable, the shipping was very fast and the assembly was easy. Overall it’s mainly just functionality problems