I have to say that FaLang is by far the best, most comprehensive, easy to install, and easy to use extension I've tried.
As a drawback, I had an issue in translating some specific HikaShop features (HikaShop Badges URL - so it was pretty specific). I emailed the developer describing the issue in an hope that it could be resolved in a future release.
Within minutes, not only did I have a reply from Stéphane, but also a solution. So, when it comes to support, it's way above what you could expect and way above excellent.
Thank you Stéphane for an exellent extension and for excellent support.
What really makes this extension go far beyond great and excellent, is the level of support and responsiveness from the developer. The support I've received goes well beyond what should and could be expected.