KillCopy v2.85 is the May be, I tested a FastCopy and KillCopy have a constancy, something a can't say for FastCopy. About terra copy i can say that program is not bad but buffer i to slow compared with KillCopy and FastCopy. KillCopy uses a 1000 mb of ram, FastCopy - 35 - a little advantage in this aspect for FastCopy. Advantage for KillCopy for me is the resume manager into a program and very easy build of Queue then this is important. In FastCopy this option is a little difficult and i have this one for "defect", if a can say that. So after a few test my choise for now is KillCopy. Works great on XP (32&64)bits, Vista (32&64 ), bits and i have no problems with work of the Russian product.