I bought these maybe 6 years ago. I only got 3 which were the sizes I needed (snapped inferior ones frequently).
Anyway 13, 16 and 18mm sizes.
These have taken daily hard use with no complaints, they owe me nothing. Quality wise they are as good as the big names.
I have used them almost daily and they have been heavily used, often another spanner or tube over them to crack off tight nuts and bolts and even me standing on them to crack bolts. The 18mm has been subjected to hammer blows and also being jammed against chassis rails to crack off crank bolts etc.
This next picture shows the 18mm spanner, this is at the open end of the spanner. The dings are from me belting it with a hammer to free off stuck bolts. The finish has not chipped off or lifted on any of them.
The jaws are undamaged apart from the edges where they have slipped on badly rounded nuts/bolts, even then the damage is miniscule, this picture shows the worst affected which is the 13mm
Ergonomically they are actually quite good, you can use them for a while without getting pissed off with them. The size of them also means decent leverage is available, the steel rule is in this pic for scale
Overall an excellent buy, they have stood up to long term hard use fine. They are also a lot cheaper than say snap on spanners and quality wise they are not very far behind. 8.5/10