Googled:<p><a href="http:&#x2F;&#x2F;openbci.com&#x2F;forum&#x2F;index.php?p=&#x2F;discussion&#x2F;155&#x2F;comparisons-with-other-consumer-commercial-eeg-devices" rel="nofollow">http:&#x2F;&#x2F;openbci.com&#x2F;forum&#x2F;index.php?p=&#x2F;discussion&#x2F;155&#x2F;compari...</a><p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Comparison_of_consumer_brain%E2%80%93computer_interfaces" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Comparison_of_consumer_brain%E...</a><p>An excerpt from the forum post seems to point out that openbci uses the most advanced amp:<p><pre><code>  Regarding data quality, I don&#x27;t know of any other consumer
  grade equipment that has the research &#x2F; commercial grade amp
  we are using, the TI ADS1299.  24 bit samples, programmable
  gain and sample rate, delta-sigma ADC design, sensor location
  flexibility, on-board programmability.  Much of the consumer gear
  has fixed 10-20 locations and only a few sensors, closed source approach, etc.</code></pre>