I enjoy shopping on M&S, I can always find something I want, but then I have to checkout.
I do everything online and I like to think of myself and fairly savvy, but their checkout has fooled me several times. I think I'm done, walk away from my tablet or pc, wait a few days, wait a bit longer and my stuff doesn't arrive. There are just too many steps in the checkout - you think you're done when you're not.
When I do get it right, I love the clothes! :)