timo888 wrote:A spring lever is no more difficult to master than a pump machine. Get the grind, dose, and tamp correct and you're well on your way to pulling a good shot.
That hasn't been my experience with the only spring lever I've tried, the Elektra Microcasa a Leva.
timo888 wrote:The Achille's learning curve is steeper than the Lusso's and so is its price... Another advantage of the Ponte Vecchio is that it does not have a 58mm basket.
I cannot comment on the Lusso since I've never used it. However, the Achille certainly has one of the more modest learning curves of the machines I've used, non-levers included.
Online discussions are replete with assertions that "machine has X, therefore it behaves like Y" from those who have no hands-on experience (me among them

). Frequently they're right, but not always, proving the designer's adage, "The Devil is in the details." The Elektra A3 was my clearest firsthand experience with the risks of inference from specifications. Based on the lack of preinfusion / immediate pressure ramp and rotary pump, I expected it to be a difficult espresso machine to master, similar to the La Marzocco Lineas with large gicleurs I used before. Alas, I was surprised to be pulling very good shots with little effort on the first day.
Jim documented a similar experience with the Elektra Semiautomatica, which I would expect to perform horribly based on its temperature profile. From
Why is the Elektra Semiautomatica So Good?:
another_jim wrote:The consensus of North American espresso experts since Schomer is that the quality of a machine is mostly determined by how stable and adjustable its temperature and pressure are. My experience with the Semiautomatica convinces me that this is not even close to the whole story. It is not particularly stable on temperature and way off on pressure, yet it produces shots that spank many machines with far better temperature and pressure performance. Moreover, after I added pressure controls and got very painstaking on temperature, the shots did not improve, although it allowed for more latitude. Finally, I get interesting and tasty flavor variations by changing dose and grind. In contrast, changing any of the variables on many other machines reveals that the shots are lousy outside of a tight "sweetspot" range.
The conclusion to this is obvious. There is a factor to espresso extraction that we are hardly aware of, and that the Semiautomatica does a lot better than most other machines on the market.
I've given up asserting performance from spec sheets or similarly designed models. The carefully prepared temperature and pressure profiles you'll find posted on HB are interesting, but again, I no longer believe they have strong inference value to the result in the cup, rather they "support" the conclusions we've already drawn from tasting.