I could not be more happy with my Hx and have zero interest upgrading. And I do suffer from bouts of upgraditis, especially when it comes to grinders. The Hx has fewer things to go wrong and its temperature stability is rock solid. I have installed Erics thermometer, which I used early to understand the flush, but since then only when I've made a change to pump pressure.
It's really been interesting for me to observe the continuing conversation about cooling flushing. I quickly saw with Eric's thermometer that once you're about 2 seconds past the popping and hissing the flush is over. My other early mistake was heating the machine for an hour with the portafilter locked in. But the flush is the simple step of holding the lever open for ~7 seconds in total and off, once.
What I also learned with the Hx is the pstat setting doesn't matter compared to the Cremina or La Pavoni. There are threads about this for my Hx on this site but I tried different settings - it was a waste of time, but a good learning experience. Of course this Hx is not a Cremina, but it was where I came from, and now I came to understand the reason ECM put the pstat valve under the covers - you can't mess with it unless you're determined.
On the other hand, pump pressure gets virtually no comments compared to flushing, and I'm astounded at the difference it makes in bringing the best out of a roast. Not coincidently, ECM put the pump pressure valve under the water lid and made it work with a small coin - easily accessible and 1/2 a turn can have a dramatic impact on flavor.
Taking posts at face valve and marrying up my experiences over the last 1 1/2 years with this Hx I tend to think the flush is blown out of proportion because modifying pump pressure is hard on other Hx's or there may be a lack of awareness. I re-read the ECM owners manual and they don't cover this topic at all in the English section.
This link is a good review, and Ken's observations about temperature stability match mine. It also links back to the HB.com review.http://coffeegeek.com/reviews/commercial/ecmtechnikaiv/keno/6601