Works:I've verified that these correctly function as null-modem adapters. Also, in the batch of about 20 that I ordered, none of the ones I received are duds.Great price:Consumer retail null-modem adapters are often roughly $10 or so. I was very grateful to find this item for such a low price.In fact, due to the low price and low weight, I ordered a couple dozen. The S&H only increased slightly between quantity of 1 to a quantity of 20, which makes sense because these are so small.Simplifies life:Because of this slim Null Modem adapter, I no longer have to guess whether a serial connection between two devices requires a null-modem cable or not. Instead, I just use a plain serial extension cable, and then if the connection doesn't work right away (or, for a dead givaway, one side of the connection is male-male), popping this adapter right in the middle is a quick and easy solution.
Rating: [5 of 5 Stars!]