Though a little pricey, I have always found Mini-Circuits products to be reliable and to perform as advertised. All five of these attenuators measured the same and well within their limits for return loss and insertion loss within my band of interest (dc - 100 MHz). The connectors fit well and cinch down tight, and the attenuator bodies don't wobble or rotate when the connectors are tight. In the world of attenuators, these are all delights.