The biggest swiss online seller makes charts for warranty claims. Basically: how many warranty claims does each brand have? This chart only shows the most popular brands of coffee machines sold on the site, but I still find it interesting.
I talked to a kitchen outlet staff member and asked about the Smeg brand, because I liked it's style but thought it expensive. She said that they tend not to be good at all and I should avoid the brand. That there was both cheaper and more reliable alternatives or pricier higher end goods.