title_body: Difference between XM and XM+ receivers? I have seen both XM and XM+ receivers and am wondering which one would be better to get for a micro-drone build. What are the differences in specs? (range, reliability, weight, etc)
upvoted_answer: According to Oscar Liang, the XM+:
  
  
  Is larger and heavier than XM (21.5 x 12 x 3.5 mm – 1.6 g)
  Has diversity antennae, unlike XM
  Has solder pads in addition to pin headers
  Doesn't support Smart Port telemetry
  Has RSSI channel support on a dedicated pad and 16th channel
  Has a wider input voltage range than XM (3.7v-10v)