Yes, this is for the most part true.
After installing, its buggered, but to be fair, it does stay fairly well in order.
I have said it before and I will say it again... The DeFrag tool is one of those tools that dont really make all that much difference one way or another. Its really mostly down to personal preference because while the user interface is different between them, the actual defragging routines are the same code.
Only issue I doi have with Windows' defrag is that it does not know whether it needs defragging or not? - Many-a-time, If you use Windows it will say that it does not need defragging but when you have a look with a thrid party defragger, you can see quite clearly that it bloody well does.