An excellent plugin. Does what is says on the tin.
It does require some backend html and CSS knowledge to get it to work how you wish.
A little harder to manage than it's predecessor Riva Pro.
However, having said the above, I would recommend this plugin to those with a little technical skill.
It would be 5 stars if it was a little more user friendly - however, I do understand the complexities of trying to get a plugin to work consistently in a WordPress installation.
And well done to Matthew - stirling work and excellent customer service and support.