I have been with Ancestry for a year and appreciate the size of their data bank. When paying for a membership, with Ancestry, I find that one is really paying for access to their documents and other information which can grow your tree.
The site itself and the tree you generate on Ancestry has several flaws pertaining to the IT side of things. For example when you attach a census form it will show on the tree as either a census or a residence or even both. When it shows as a residence the information is usually incomplete, so you could have Norwich, Norfolk and nothing else.
Many times the Sources do not link to the Facts so one has to spend time doing that manually as well.
As for their Support Ctr., they make an effort to help but they are only there to walk you through the very basic of issues.
Before you take out a membership with Ancestry be sure you know what you expect from them and read their agreement form carefully.