whenever you need to expansion you also need power and ground. That is not on the expansion connector. If you need an interrupt that has to go to the host interface, not the expansion connector. There is no way to mechanically fix the card, i.e. no mounting holes for screws or sim. Read more
Pros: very easy to use. I just connect to raspberry, used the wiring pi libraries and it worked like a charm.
You can cascade more modules Cons: missed some way to hold it. It is very small and has no screw holes. But I knew it looking at the pictures.
It worth the value, mainly because the raspberry pi has a limited IO capabilities. Read more
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