With all of the hype surrounding JoomFish ("JF"), I was excited to incorporate it into my site. After experiencing its incompatibility issues with other components/modules/mambots and the lack of documentation and absence of reliable support(countless months-old dead-end support questions on the joomfish forge site), it left me wondering why anyone would want to unleash such havoc and chaos upon their web site. Trust me, if you are interested in any combination of aspects such as e-commerce, SEF, 3rd party forums being part of your Joomla site, this is one headache that you really cannot afford. The fact that we now have translate.google that can be implemented with Joomlaspan's Google Translation Module in A COUPLE OF MINUTES makes the idea of JoomFish even more futile...I know, I know, with JoomFish you have "control" of the translation (says JF devs), but in my opinion, it is at the expense of losing control of everything else on your site!...see for yourself in the developer forums, or better (actually WORSE) yet, try it for yourself.
And for those who may have hacked their site to pieces, installed add-ons, even purchased commercial licenses for a particular VERSION of a component in order to make the whole thing function 'normally', then what happens with the next upgrade of any of those items?
Do you really need it?