Reasons to get the paid Macrium.
1. Incremental / Differential backups.
2. File and folder backup.
3. In version 5 cloning.
4. The WinPE recovery disk.
I got it mainly for the file and folder backup and the WinPE recovery disk (The linux disk didn't recognize my backup drive consistently).
My habit is to do full backups, so item #1 isn't much of a benefit for me.
On item #2, can't you retrieve single files and/or folders as needed from a Macrium full backup file? Ghost has a tool for this called "Ghost Explorer", so I hoped Macrium would allow this too. Maybe I have your meaning backwards though. Maybe you mean that paid-for Macrium lets you ~backup~ less than whole partitions, down to files and folders?
On item #3, I find cloning and imaging confusing since in my frame of reference (Ghost.exe) they are more or less the same thing. Evidently not with Macrium though. I suspect cloning means backing up a whole drive to one file even if that one physical drive has multiple partitions, whereas imaging means backing up up one partition at a time to individual files. Do I have this correct or is cloning something entirely different?
On item #4, I have read that the kind of recovery disk a program makes is important due to compatibility issues. Some favor (or bad mouth) Linux, some like BartPE, and now you have mentioned WinPE. Is the paid Macrium's WinPE based recovery disk an important benefit, something I would want? If so, I will certainly get the paid version.