I have one that's pretty similar in design to the one you've posted the instructions for - a little less fancy in that there are no controls/display on mine, but I can't say that I feel I'm missing anything...
IMHO it works pretty well, we've had good results from everything we've tried. It's very simple - chuck all ingredients in a bowl, wait for the machine to chill, pour in, turn on, wait for it to be done. Takes maybe 30 minutes to turn stuff into ice-cream / gelato.
Results are edible directly, or keep in the freezer (obviously!) if you want to make in advance - the latter also gets you something a little firmer, direct from the machine can be on the soft/melty side as obviously it's still almost soft enough to churn at the point the machine stops.