I must say - i like this plugin. So far it seems like the best solution for multilingual sites. BUT - it need some more functions. First of all, ther are no settings and i really will appreciated when there is a option to add custom post types to work with Bogo so you don't need to add it manualy in core .php file. Second - there is no way to translate also your theme with this, so all fixed elements can't be displayd in another language. There is also tahat menu and widget things - you can't translate them also.
But - i see a big potencial in this so i'm giving it 4*. Maybe sometime it will be the best multilingual solution and i will giv it 5*.