As said before, £90 fitting is a joke.
I've got a set still in the box that I haven't got round to fitting yet. I'm putting it off because I'm debating whether or not to fit Blue Motion side skirts. However, so far the car has stayed fairly clean without them. What mudflaps do help with is tar spots and I'm starting to pick up a few of them, so I better pull my finger out and decide what to do.