I've used Auslogics and it's fine. Puran
is another good freeware.
I've used Marcrium quite a bit. It's very easy to use. I also like Easus ToDo Backup
With any image backup the first thing to do is burn the Boot CD and see if your system boots from it ok, and after booting that you can see your hard drives and any external drives that contain the backup images. Usually the only thing that goes wrong with image restore programs is they cannot handle a particular disk controller. If it can see everything you are usually good to go.
Some people keep a small "dummy" disk partition just for testing image backup and restore. Have a few files on it and do MD5 Sum on them. After restoring the dummy partition, check the MD5 Sums are the same.. etc..