Even it you found the best documented tree on the net, why would you want to download the entire tree? My database contains all of the data for my wife's and my families. It also contains information on my daughters' husbands' families. There is no one who could use the entire tree. If my brothers downloaded it, over half (My wife's side) and my daughters' husbands' families would not be applicable to my brother as he he has a different wife, and his children have different spouses' families.
The only one who would find it completely applicable is my wife and she already has it.