I have the older Nikon AI automatic tubes with prong and pin for pre-ai. They are great quality and I know I can trust them. And I also have the set you linked to. This set is consists of several threaded anodized aluminium rings. It also has the male and female bayonet coupling mounted on a thin threded ring. They work fine in the manual mode. The biggest concern I have while using this set is the rigidity of the rings. Sometimes while focusing, these rings want to loosen and slightly unthread. Also the quality of the mounts isn't that great. If you use them be sure to support your lens, just incase. But they are made in China so what can you expect? But they definately are the least expensive way to a good macro shot.
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