The best replacement for mcpx is 130x.

The best alternatives to mcpx are rated as following:
★★★★★  130x
★★★★★  v922
★★★★★  msrx
★★★★  mcpx bl
★★★★  450
★★★★  nano cpx
★★★  genius cp
★★★  mcpx
★★★  super cp
★★★  cpx
★★  blade 450
★★  120sr
★★  mini cp
★★  ncpx
★  walkera genius
★  120 sr
★  trex 250
  v911

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Speaking about mcpx, one probably shouldn't forget about hp6dsm.

Other search terms related to mcpx and their ratings are:
★★★★★ hp6dsm
★★★★★ dx5e
★ dx4e
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Google Trends

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mcpx
130x
v922