by another_jim on Wed Jul 14, 2010 10:48 pm
Talking only in terms of coffee quality ...
Back in the day when the Rocky and Silvia were the top end kit; there were lots of coffees and roast levels nobody would have dreamed of doing as espresso. When the Mini and an E61 box took top place, the choice of coffees widened; but for the most part, Centrals or East African at medium or lighter roast levels were still off limits. With the top level kit nowadays, there are still occasional impossible coffees, but they've become much rarer and cannot be predicted ahead of time. You need to try the coffee to know whether it'll work or not.
Part of the reason of this expansion is improved techniques. These techniques would not have been discovered on lower end equipment, since these aren't consistent enough to work out the fine details. But once the techniques are worked out, they can be used with more entry level equipment. So I can do a lot more with a Rocky and Silvia now than back in the day. But the choice of coffees you can use is still more limited than with the best equipment.
I would suppose the "knee" is a level of kit that would let you try any coffee that people are talking about, and get a fair idea of what the fuss is about. My feel is that the Jolly and Vario are just on the cusp of this level, but that they could turn out to have a few blind spots. That makes the Vario a very good deal in terms of price/performance; but it might not turn out to be your last grinder.