I ordered these adapters to test some RF gear. Before using the adapters in my testing I wanted to sweep the connectors to see their response at higher frequencies. The return loss started falling off at 1.1GHz and was what I consider unusable (for my purposes at least) at 1.4GHz with a RL of -11dB. The adapters work great at lower frequencies though (particularly good around 600MHz ± 200MHz). For the price you are getting a great product, and a professional connector would cost orders of magnitude more, so if you are not concerned with RF >1100MHz I would recommend buying these connectors.
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