And the winner is?
The Electro and Ebay one are 3-stage motors so should both be higher on lift. The 6.6 is more about airflow. The Electro one also draws nearly 9 amps, compared to about 7 amps for the 6.6. The 6.6 will probably come 3rd for lift, but the 6.6 would win if you were measuring airflow. The 6.6 would draw with the Electro if you were measuring overall vacuum power (airwatts) despite drawing nearly 2 amps less - you get more power per amp with the 6.6's because they're more efficient.
Its all a fix only joking John
Close call, i still stick to my origional post. Do you have facility to measure cfms John?