Full user review
"Works well and it is free"
FREE is the number one Pro. I have used WinZip for years but I do not think it is reasonable to require users to buy a new version every three or four years. I use ZIP compression because it is good enough, with WinZip and other paid products I keep buying the same function over and over. 7-Zip may not be as elegant, but it works.
7-Zip is a bit harder to use and lacks some modern features and compression methods.
If you need a good file compression tool and do not have to open files that 7-Zip does not support - then you should try the Free utility first and only buy one of the competitors if 7-Zip does not do what you need done.