I've owned the BDB and a Mini Vivaldi (for steam it is the same as the dream T I believe). What Breville has done is that they have configured their steam system to be able to produce excellent microfoam. What I mean by that is that although it is not powerful, it IS effective and easy to learn.
The Mini Vivaldi on the other hand has very strong steam and IMHO there is a learning curve to managing it to get excellent microfoam especially if you are steaming 5 ounces and less. But once you have learned you can then produce excellent microfoam.
I've used both and have been able to produce quality microfoam on both, but they do feel different in use.
avraptorhal Senior Member Joined: 20 Mar 2014 Posts: 64 Location: USA Expertise: Just starting
Espresso: Gaggia New Baby Twin, OPV... Grinder: Forte AP Drip: Bonavita Immersion dripper,...
Posted Sun Dec 14, 2014, 6:16pm Subject: Re: Breville Dual Boiler Espresso Machine
I don't know if this is permissible (a note of a review on HB). But, John Weiss has posted a positive review of the 920 on HB. It is prominently posted on the web site.
I've been lurking on Coffee Snobs for a couple of weeks and their posts, quite a few, are generally positive. There are several reports of 920 serious problems rendering the machine inoperable that have been handled by replacements. As someone pointed out (Mark Prince, I think) espresso machines have replaced Mr. Coffee type machines on the Aussie discount store shelves. It would seem to me that the Aussie home market is a much more critical audience in both requirements and size than our home market.
That's kind of a non -sequitur. The QM Silvano uses two vibratory pumps, as does the BDB. Vibe pumps themselves do not have adjustable outputs without some sophisticated electronics, which Phil said Breville has some patents pending for. The traditional way to "adjust" pump output pressure in a vibe pump is to set an upper limit via the OPV. Breville, being a large company that does big business in lawsuit-happy USA, would rather you not open up your machine and start making your own adjustments. BUT, that said, it's ridiculously easy in actuality. The Silvano touts an externally adjustable "expansion valve". If that does the same thing as an OPV, then it would be easier to adjust than the BDB. Me? I don't do a lot of adjusting. I set my BDB's OPV a little lower than stock, to start bypassing at about 9.5 bar on a blind basket, instead of 10 bar. Just personal preference.
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