DOS Ghost (as developed by Binary Research) is arguably still the most powerful yet simple. Command line useage can effectively automate the process for use by beginners which cannot be said for interfaces of Acronis products and such as, no matter how purty they are.
Also, it is queer how True Image is not capable of copying a partition and instead requires Disk Director. TI cannot fit on a floppy and garners further demerits by not being completely uninstallable from Windows so, ironically (and somewhat paradoxically), to keep a clean system it must first be imaged before installing even to create the Linux boot Rescue Disc. Reportedly, the company intends to release a thorough uninstaller but the issue has existed for years. TI also does not conform to current UDF standards (being limited to reading ye olde 2.01 sans index redundancy for both performance and integrity).
All that said, TI is handy for use with pre-installed Windows environments.
Depending upon one's needs though, there are a number of freebee proggies available these days, as said, which may be fine and usually better than the utilities provided by HDD manufacturers.