I have a pair of these fitted at the moment. I knew I was going to be taking the top fairing on and off a few times and doing this with the standard mirrors / plates fitted is time consuming and awkward.
I got mine from Amazon for £20, so the M&P ones seem good value.
They look fine and work well enough, although half the view is elbows of course, unless you move your head to one side a bit!
Quality seems good for the price - no problems with them at all, although they don't come with fixing nuts/washers - just the attached bolts. Not a huge problem.