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Thumbs up!
Involvement:General (knows how to use it) - Ownership:1 day to 1 week
Pros:Does exactly as expected and actually much smaller than I expected. The slots to connect the power line you wish to control are close together though, so keep this in mind.
Cons:The LED on the board is extremely bright. I didn't think I would have to do this, but I might just have to wrap each one of these in some electrical tape. At night whenever my Arduino turns on the relay for the A/C unit, the whole room lights up.
OtherThoughts:Good build quality. I bought a whole bunch of these from DX for a home automation project. Work like a charm and are the best value on the internet.
Bottomline:Definitely purchase these if they can handle the current you will be drawing!