The plastic electronic replacement controllers are pretty flimsy feeling. But for $20, I don't expect very much. They work for me, and that is what I care about.
A new replacement foot control for my friend's mother's Bernina 1000 (mid 1990's) runs between $90 and $200. A replacement for my mom's Pfaff 1222se starts at $90, used. Scary. I treat that foot control and cord set with great respect.