Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not as good as Zojiruchi

I have a Sunpentown and a Zojiruchi - The Sunpentown doesn't work properly, as per other reviews here; the Zojiruchi works perfectly after a number of years of constant use. Also, the Z- uses less energy than the S- in standby mode, and probably while boiling as well.