I've noticed the following problems in the French version:

• accented letters represented in code
• fairly common words not recognised (e.g. "courriel" the French for email
• the words suggested are often rather strange (in the opinion of people on the French forum)
• the propositions are hidden behind a popup box (see attachment)
• difficult to use the Firefox spellchecker which is much better (Thanks to Alexandre Scherbyna I know you can use it if use the "Paste from Word" button.)