First of all, i would like to thank the author for a wonderful plugin. I think this is the best free plugin available for multilingual blogging in WordPress. To me, using Network is a way to go.
Can I suggest couple of features which were not yet mentioned by others:
1) Automatic creating of draft pages corresponding to original page (with tags, categories and featured image transfer)
One could have a drop-down menu to choose another language and a button "create draft" which would copy-paste the current post to another language. I learned that there are limitations related to media not being shared among network, maybe images can be copied, for starters.
2) Use "This post is also available in" in proper language so that it makes sense. Maybe a translation of that phrase can be left to user so that when combined with "description" of a language (Settings->MLS) it makes perfect sense. Right now it is something like: "This post is also available in Deutsch", where as it should rather be: "Diese Post....Deutsch " and "This post... English".