There is nothing wrong with those type of cake tin, as long as you understand what they are exactly ..
Euro Tins [http://www.eurotins.co.uk/] and The Cakes World [http://www.cakes-world.co.uk/] are the "same" - a British company. This Amazon site appears to be an off-shoot ...
Back to the tins - they are tin ...tinware, to be precise .. They are welded, not pressed or spun metal like others. They can leak if not manufactured well.
They darken with use.
Don't scrub, as they can scratch.
They hold the heat well.
They last a life-time.
My oldest is nearly 60 years old ...