What advantages specifically does the ability to adjust the OPV offer?
What are flavor/shot performance signs that a high-pressure problem may exist?
Does anyone know if it's possible to attach and adjustable OPV (like the new Silvia's for example) to a Gaggia Coffee Deluxe?
My double shots taste pretty good, I'm getting a fairly consistent shot down. Now I'm wondering if an adjustable OPV setup would offer noticeable improvements in my espresso. I find myself to be an espresso purist and only drink straight doubles. I'd like to get the best shot I possibly can with either the machine that I currently have, or one in it's class. If money wasn't an option I wouldn't be asking this and buying a GS3...

Edit: I ran across this from 1st-Line and now I'm more confused than ever! It reads:
NEWEST Feature: The overpressure valve is now adjustable on our latest batch of Silvias. The overpressure valve is normally set to 11 bar. However, if your grind is just right, the grind should only create 8-9 bar of resistance so the overpressure valve will never open.
Ok so if that's the case then why is an adjustable OPV needed or used? There has to be a reason because people are using them and swearing by them. What does it allow the barista to do? What advantage does it lend? In theory can't the barista adjust the grind (or even the tamp) to compensate for a possible pressure problem? Afterall isn't brew pressure regulated by coffee grind and puck density?
Man I'm so confused...help me out here!
