Hi Scott,
I have been using Powerbox equipment on my Spektrum radios for about 6-7months now. I have a total of 6( 4 jets and two big prop models) models flying with this combo and all have worked perfectly.
I spoke to Emmerich ( The designer and manufacturer) of power box products some months ago and he told me that they had tested all their products with all three of the major 2.4 ghz technology products on the market with 100% success.
Hope this helps?
Regards Al