The extension works brilliantly and without any problems whatsoever. The only issue I had was with the language pack I created myself (since it doesn't exist), but amazingly Stephane went into it, found the problem and sorted it out for me also.
For me this is not an alternative to JoomFish but an excellent multilingual management system of it's own. I strongly suggest anyone using Joomla 1.7 to use this extension for their multilingual websites and not waste time trying anything else. Rest assured that if you encounter any difficulty, you will find Stephane ready to assist you in a simple, clear and extremely helpful way.