I have downloaded my ancestry data, and uploaded it to Gedmatch/FTDNA & My Heritage, as well as Living DNA - though nothing from them as yet (as per recent discussions elsewhere here), but I have found very little. My Heritage is slightly better as it has a larger proportion uk based customers, though the only person to reply to me is someone I already knew about. As others have said, 2 things stand out:-
practically nobody replies to you, and
people near the top of your Gedmatch/My Heritage/FTDMA match lists, are people you may not have found, but are already in your stats, just at the bottom of page 2 of your Ancestry matches, and you haven't quite got there yet!!
Like others have said, a chromosome browser would make Ancestry so much better!!