Rated 5 out of 5 stars
I too was appalled by the low rating that some gave xMarks because I am VERY happy with what I get from XMarks - perfect Bookmarks syncing. I don't make use of any other feature and I haven't had issues with bookmarks being unexpectedly wiped clean.
Their option to 1: sync both server and pc 2: keep pc erase server 3: keep server erase pc (not in the same order ;) ) helps me keep my bookmarks free of the default ones that a newly install browser comes with.
Spend a couple minutes setting up XMarks the way you want and then u never have to think about it!