I have Cmann SAE (USA) and metric (China) and for DIY, they are fine. I've had no issues with the broaching when I herf on them. China Cmann and Tekton are probably very much alike. What I hate is the even x even, odd x odd (eg-12x14, 13x15mm) patterns. They are a ***** because I am often off a head size when I eyeball a bolt head and it means grabbing another pattern verses flipping the wrench. Both Cmann and Tekton do this for reasons unknown to me.
I also have some Harbor Freights lying around. As others say, they are cheesy. They look like cast pig iron and the broaching is sloppy. On the other hand, the offset is very steep compared to Cmann and Tekton (45 deg) and I've gotten them in tight recesses where Cmann would not go. Also, they do not do the even x even, odd x odd pattern thingy. I did cut a couple in half to get in a couple real tight spots. Because they are so cheap, they come in handy for that.
The Stahlwillie sets linked here look like the best of both worlds. Quality broaching, steep offsets, and even x odd patterns. I would go that route if I were to do it over again.
