Btw, the most popular RX's in combat are the Hitec 555 and the new Electron 6. They have proven to be durable and able to handle even "worst case" heats and flightlines.

Personally, I've used some FMA RX's as well. The FMA RX's are a bit on the fragile side, espeically the caseless ones. (I now won't run any caseless RX's in combat. A well designed case can really make the difference between a working RX and a broken one after a hard mid-air).

Polk makes a small 6 channel RX that is crystal-less. That could mean one less thing to break (crystals are fragile by nature), and if you have a synth TX, like the Polk or Hitec, then you can change channels if you get to contest and have a frequency conflict. I haven't seen one in person, so I have no idea how it will hold up to combat use. A couple of guys have them and are happy with them as far as I know. But until they've been out in the field for a little while, I'd hold off if you can't afford a backup RX.

(btw, for that reason, I travel with crystals on 2 channels. In my case, I have enough ch 27 and ch 19 in my box to change most of my planes over if I need to. I have a few oddballs as well, just in case).