I haven't had any problems. When I have had 'finger trouble' with the set up, I've received very prompt support in the forum.
Software updates have been reliable and I have confidence in the developpers.
I am now looking at using the latest Social features of this plugin so that I can set the image I want Facebook to pick up for my site and have Tweet / Like and Plus One buttons where I insert the 'Social' Tag onto my pages (there is also an option to have it before or after articles).
I feel the price of this extension is just about right. If you are looking to make your Joomla site Search Engine Friendly, I would highly recommend SH404SEF.