I am trying to be preventative of issues. Ultimately the efficiency of range is what I am looking for, I want a clean noise floor both EMI and RF for the 100mw 433MHz data link to be able to both transmit and receive to the greatest distance possible, and for my 1.3GHz video link to get the best range possible without anything interfering with anything else. There will be a motor and servos running on the same battery too, as well as autopilot, OSD, GPS, Etc, so I think filtering will make all of the difference to get the best performance.
That particular product in my OP according to it's specs are supposed to filter something from 1000MHz to 1400MHz noise, I guess the idea is to prevent noise from getting into the video TX, but I don't know enough about RF to know really if this circuit was good for the purpose or not.
I am still waiting on some components to get in, plus I think I am going to order one of those USB SDR's (Capable of 50MHz to roughly 2.2MHz), which I could use as an RF meter to test RF noise, and I will see if my DSO Nano is capable of spotting any power noise on the power rails.
At this moment I am trying to really pre-plan everything as much as I can.
One thing I know is that 433MHz has the ability to create harmonics close to 1.3GHz, and 1.3GHz can effect GPS, but luckily the airframe I am installing this onto is quite large so separation for RF components should be pretty good, but it also means longer wires and EMI to consider, toroids will be used on pretty much everything getting a power rail :).