Eh, I've found Tekin to have less reliable products (I've had a couple of ESCs gone bad). So because of faulty product, I've dealt with their customer service more often. As far as reliability, I've never had a single issue with my Hobbywings, Castle, or Orcas. Much more robust.
Tekin does not stand behind their product, they'll just "sell" you a new ESC at their own cost instead of repairing your item. It is their business model. I don't know why so many people see this as a positive back then. Granted, things are probably better in the 5 years that I've gotten rid of all my Tekin stuff. But the 3 times I dealt with them have been negative.
Take my experience with a grain of salt. I have not dealt with Hobbywing customer service yet. *crossing my fingers I don't have a future issue*