As an experienced Joomla user with many years under my belt. I have to give this extension 5 starts.
Not only it works out of the box, but it is also fully customizable so you can make the design look like your original site with very few limited skills required.
But most Impressive of all is their tech support, not only it is excellent, but it is fast, fast, fast.
I found myself with a few issues due to the complexity of my project, I was doing something unconventional.
As soon as I reported them my issues, they responded immediately within minutes and created a new version with all the improvements I needed to make my project not only possible but to run smoothly.
We even encountered a bug on the i-phone 4S working on landscape mode. (Not a bug on the extension, but a bug on the i-phone device itself!). As soon as I communicated this issue, they wrote a code to bypass it, literally within minutes and sent me a new version of the extension.
But the most impressive thing of all is that all these happened during the weekend! (Talking about great tech support)
Undoubtedly my best experience so far with the issues that comes with acquiring a new extension.
If you need to make your site responsive or need a responsive version for a tablet or a mobile device, you do not need to think twice, this is the extension for you.