I for one like the fact that the backup is a holding place for all files and that deletes do not follow to the backup. Since you can add a "delete the backup" before you do a backup, it seems there's an option for folks who do not like this feature. I think the main argument revolved around vocabulary and use of the word "mirror".
I like the product, its my new backup software. If you change it, please don't remove features, just add new ones (or change the vocabulary to suite the pedantic whiners).