What about multi-language use?

Hello everybody,
I found OpenCart and I like it so much: complete, easy and clear!

I should run a e-store in 5 languages ita/en/de/esp/fr and I would like to know what's the state of the multi-language use.
I read about some problems... are they fixed?
And problems are in both versions (old php4 and new php5)?

Please let me know.
Regards,
Diego