Stiftung Warentest
In 2010 Stiftung Warentest rated the model TM 31 with mark 3.2 (satisfactory). The price of 985 euro, the high noise level, and the lack of grating and slicing functionality was criticised. The successor model TM 5 was rated in 2015 with mark 2.9 (satisfactory). The noise level (measured at 91 decibel) was again criticised, and the testers said that this was the reason why it was rated down.