I like that my backups always work even if there is an issue with it so far i have never had any problems backing up but when you do run into issues they usually come very quickly which makes them quite easy once resolved! There really isn't anything bad about using these products as long at your not having serious errors occur then all should be good just make sure before use how well their backup programs will fit what type/kinds file systems etc..
we back everything off our servers daily including windows images virtual machines applications database's website email ect...