I've been using my Cremina exclusively all week. The gauge is not only fun, but I feel I'm reaching some previously unreached potential this week. It is very confidence inspiring. The coffee off of my Cremina / Pavoni's while good, has never matched what I could get from the President. With this gauge I am able to replicate my profiles from the President on the Cremina. The result? Really tasty coffee. They still have their own particular characteristics but I no longer strongly prefer the President like I did before.
If nothing else these piston pressure gauges will drastically reduce the learning curve on the Cremina or Pavoni's. And some of us veterans will discover some surprising things about our current technique as I was.
I shot some video, but my kids hijacked it, and for me video editing is like pulling teeth, so it may be a while before I have something to post here.