Thanks for the nice words! I'd have to say I'm more of an electronics geek than a coffee gourmet, so the thrill of the project was the driver. Being able to slow the pump delivery rate has made a difference though. I'm finding milder flavours and a more interesting shot. There's a lot of freedom in being able to grind the beans a bit more coarsely and then adjust the flow profile without having to get out a spanner, take the top off the machine and tinker with the OPV. Points out the nature of a hobby too; an electronics engineer designing and building a circuit like this and then writing the code would expect to be paid maybe $100 an hour. The 100 hours this took me would then have cost $10k which would keep me in shots from my local for the rest of my life! When it's your hobby there's no such thing as economics.
