I'm using only urbackup with 12 Clients for about 1 year. Only folderbackup.
Using urbackup 1.4.14 on NS 6.9
It's easy to use and restore is also easy.
Statistics are clearly and understandable.
It works very stable. Since I installed it, it runs and made no trouble.
Centralized and easy managing of client-rights.
Workload on the client is high IMO.
The imaging-function I never used, because that would burst diskspace.
Diskutilisation is high, because it has no compression.
EDIT: Clientsoftware has to be installed on each clientmachine
The next weeks I'll have a look on urbackup 2 on NS7.
If I can tell more then, I'll do.
Have a nice weekend!