I quite like the platform. One of my sweetest shorts is a no dash 6" 586. And that full underlug gives it a badass look.
I don't prefer L frames over K and N. I enjoy each for their respective merits.
If I could only have one revolver, it would probably be a 4" model 19/66. But if all I owned was a 686, I wouldn't be sad about it.
One of the fun things about the S&W revolver line is that the whole spectrum of preferences are available.