@symbolipoint: the basket has two spigots and fills two 2 ounce espresso cups at once, so two servings or one double shot serving if you combine them.
@caz: yes, somewhat unavoidably, the temperature of the steam varies slightly, since there is only a light that indicates "readiness" to brew, hence the time required varies as well, but one can see how quickly the cups are filling, and how thin the mixture is. I suppose I could wait until the light goes out and then begin precisely when it comes on again, but I get impatient. To be honest the weight sometimes varies a bit too, since the scale is only in tenths of a gram and some beans weigh more than a tenth, so a full load is about 160 beans ±1. I am also not sure I have the ideal grind setting, since each click of adjustment changes it by 12.5 microns. always room for improvement.