Necessary for your Sound Devices Recorder
If you have a SD 788T and want to be able to use all (8) of the mic inputs with standard XLR mic cables, these XLR-TA3F adapters are necessary. They work as expected with no surprises like polarity reversals or unbalanced line shorts. They use decent quality connectors and should hold up to normal field use.
Sound Devices really should include these with the purchase of each SD 788T, bust since they don't, you should buy (4) of these.