the small opening and nib inside make it harder to clean the spots that accumulate at the bottom from leaving on the heating element

(ignore the water spots, those can be cleaned off)

Replaced one that was glass which looked terrible showing water spots and such

It's basically impossible to drain the water, causing gross spots and mold/rust to easily form

Also, I saw some previous reviews that showed dark spots on the bottom and they called it rust/corrosion

After one use it has weird spots inside that I can’t remove and the coffee also tasted weird

I saw 3 small dark spots inside center of the lid when it arrived.