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The heating element base is stainless, the rest is plastic.
For me, 10⁰ increments are fine. Since 2012 when I got it, as I've been brewing lighter and lighter roasts and changed brew methods, I've just been using 100⁰ anyway and the lower temps are reserved for tea.
If I was using a V60 and needed a proper pouring kettle then I'd upgrade to 1⁰ increments and a gooseneck, but for what I'm using it for, I'm happy.
I've had this for over 10 years. It has been temperamental over that period but it's still chugging along very happily.