Can not understand the pejorative Rezesionen. The unit I have now for 6 months and roast every week 250g. Which reminds me not a single roasting has gone wrong. The smoke is not just for the living room and I roast in the garden. As at the results only the amount and the roasting time are varied very well controlled. Of course you can not enter a roasting profiles and select temperatures, but as an entry device a great thing. Think that you would be frustrated as a beginner quickly with a professional unit. As Röstmenge I'm generally 250g described in forums and not possible 300g by the manufacturer. Bought we untreated raw coffee beans with skin. This one can easily blow away after roasting. I'm excited. Possibly I'll buy someday an even better roaster, but this brings even 90% on the spot. A better roasting is possible only with much higher price. Not only want to drink buy recommendation for all the coffee.