Hi, can somebody tell me about differences between them two units?

i wanna buy f900 but i've seen X920 in similar price. Is it just the front panel or some hard/firmware differences? How about bypass and hacks in the X model?

Cheers

the bypass is pretty much the same (i believe that the harnesses are a little bit different, so there might be a small change) but the system its self is supposed to be much faster and more stable, i dont believe that there is any hacks for the 920 other than the bypass yet.

Ok thanks. Mods are not very important, but is nice to have something different than original:) I have one more question, what about voice commands in other languages? I mean my mother language is polish and i wonder how is it looks like? Maybe avic recognize just english? Its no problem for me at all, but would be good to speak in my lang.

they already have enough trouble understanding English, i cant imagine how much trouble you would have trying to get it to under stand something else.