Here is a simple review of all four products from HGLRC
And one long term test of F722 zeus 30x30 FC, whis is very very good. I am amazed with filtering of that fc since i had no capacitor on it and was flying on 6s battery.
LED boards are great and not expensive.
Here is link to their site www.hglrc.com/ so you can check out everything.
After 2 months of testing i would really recommend it, since i tested all on 6s, on 4s that would fly even better since there is less noise. Ofcourse it depends on your setup and skills.
And if you want to support you can buy over my aff links under.
LED boards with led controller
www.banggood.c...
30x30 ZEUS FC
www.banggood.c...
20x20 ZEUS FC mini
www.banggood.c...