Strengths: Basic 7 or 8 speed chain. Runs and shifts well on Shimano gear.
Weaknesses: Rusts if you show it water. One technique to avoid this is never to clean it, and just let the oily clag build up. It's a disposable item after the winter as you can get them for a fiver.
Overall: Cheap but looks bad unless you keep it well oiled.
Weaknesses: Difficult to get hold of cheap in your local bike shop. Need to use mail order.
Overall: Used them for years. For a change swapped for something dearer and... no difference. Great chain for an everyday normal biker who doesn't give one about 20gms weight penalty.