Or read what others who have tested it found (
here).
those has nothing to do with functions, rather he was complaining google didn't use drag and drop style installation, but AFAIK, photoshop CS3 has complicated "non standard installer" too. and palm too, which, for obvious reason.
I don't like it, but mac users will have to face it, nowadays, more and more softwares will install themselves into more and more locations, its just the way it is.
functions:
GDS does search browser history, while spotlight does not(seems). this is the finding i have so far, after 5 minutes of usage.
another one, your google homepage will have a link to GDS search, safari seems does not have it, but firefox does