I have three one cup boilers, all bought before we moved here so all over 4 years old, two are used daily, the one like linked to have a small problem opening the lid to fill, and some times we do get scale in bottom of cups, so wife descales at that point, it does not like making one cup after the other, so we have two in front kitchen one like link and other smaller model, and we make two cups at the same time, on one 13 amp socket using an extension lead which I know we should not do, but boil that fast fuse has never blown.
So adverts come on TV and I can go to loo and make two cups of coffee before adverts end.
In the back kitchen we normally use a auto knock off kettle as normally only used when we have visitors and a BBQ, we have one in back kitchen but not used much.
Why press stop button first? I must admit the large one is slower than the small one, and does not matter where the quantity dial is set, it takes same time.