Dan Kehn (Spelling?) of HB said the way the group looked to function on the shot brewer in the videos paralleled his hands on experience with the Strada at Counter Culture, so I believe it is the Strada Group. Supposedly you can manipulate the pressure, but it is supposed to be very hard to replicate pressure profile is you dive too far toward the middle pressure between 3-9bars. In the videos you can see just how sensitive the paddle is on it. It looks like it jumped 6 bar in somewhere around 1-1.5".