Some level of quality control and warranty is probably what differentiates Temco from the generic amazon chinese.Part of what you get from TEMCo is customer service. They have been very responsive when I had questions and when I needed assistance with an order. On the very odd chance that I ever broke one of the crimping dies, I bet they would send me a replacement with no questions asked.
It is still chinese but even with Temco pricing it is a bargain compared to "real" crimpers like Klauke
Manual crimping tool 120 kN
Crimping tool for manually swaging lifeline ferrules, aluminium fer and copper ferrules
koala-equipment.com