Firstly, I know most people will never need this for any reason what so ever, unless you already have a fair amount of knowledge about computing. At which point you would already have your own favourite.
Having said that, the main point of this, is you can make a bootable CD...so if you do need to partition (divide/seperate) your drive into smaller drives, you can do it much more safely by booting outside of Windows and doing it.
Why would you want to divide your partitions...well for me the reason I do it, is to seperate my data from my programs. So my C drive has Windows and Programs and the like, and then I save al my data to another drive. The reason for this, is to to make backup easier. I only have to backup my C drive as my data 99% of the time is disposable or does not change. This keeps the backups nice and small, as its only my windows drive.
If something screws up your windows drive and you have to reinstall, then having your data on a seperate partition would also be very helpful indeed.
Having said all that, I still maintain that most people won't need or want this, I am just posting it up on the off chance someone does :)
The main difference between this and the free version is this one you can create a bootable cd and it supports 64bit Operating systems.
For a comparison of the free and the professional:http://www.partition-tool.com/easeus-partition-manager/comparison.html
EASEUS Partition Master Professional Edition is an ALL-IN-ONE partition solution and disk management utility. It allows you to extend partition, especially for system drive, settle low disk space problem, manage disk space easily under Windows 2000/XP/Vista/Windows 7 (both 32 bit and 64 bit). The most popular hard disk management functions are brought together with powerful data protection including: Partition Manager, Partition Recovery Wizard and Disk & Partition Copy Wizard. Moreover, you can create bootable CD/DVD in case of system boot failure.
Extend system partition to maximize computer performance.
Partition Manager utility for better hard disk management and computer performance maximization.
New! Partition Recovery Wizard to perform PC disaster recovery to save data.
Copy Wizard to copy partition or migrate entire hard disk to another without Windows system reinstallation.