I forgot the super-duper 2.4 Ghz radio system,that $60 dollars more that it worth.
Yup, I forgot also.
I bought a Traxxas 2.4 combo from a buddy and installed it in my Mini E-revo and I have to say besides the parameters not be as adjustable like my X3S It's worth the $50.00 I paid for it. Works great.
I retired from RC, now life is all about guns and long range shooting.