The best replacement for px21 is p11.

The best alternatives to px21 are rated as following:
★★★★★  p11
★★★★  dpx21
★★★★  x12
★★★★  px22
★★★★  x11
★★★  ax 180
★★★  px3
★★  x31
★★  px5
★  sony ps3 headset
★  px11
★  tritton ax 180
★  foxtrot
★  ax 720
★  tritton
★  sony wireless
★  ax180
★  x32
  p21
  ax720
  tritton ax 720
  z6a
  x41
  dx11
  dp11
  a40

Your alternative for px21 is not listed? Suggest!
Speaking about px21, one probably shouldn't forget about dss.

Other search terms related to px21 and their ratings are:
★★★★★ dss
You have in mind a companion for px21 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of px21 in all years. Click on graph for more.
px21
p11
dpx21