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since a few days I am really fed up with sync.
It doubled my bookmark folders and some speed dial folders.
Some of the latter are empty or don't contain as much links as the original.
Annoying is that I don't know which bookmark folders are corrupted, while the defective speed dial folders are easy to recognize.
So I going to empty all and use firefox instead.
Seems as if not everyone knew about this problem. 
I've read this thread but couldn't believe that it's a general problem.
Was about to switch to opera after being driven away from firefox but things aren't better here.
Gonna rethink switching.
Perhaps try Opera again in a year or so.