Back when you could fool copy protections by having a good imaging software, it was useful. These days, it's just a way to mount an iso file. There are tons of them.
Just a mounting tool. You would be better to off looking at a deal on Alcohol 120. This has all the same features and a lot more.
Nowdays windows 8.1 and server 2012 R2 mounts ISOs without the need for these software. Wheter or not they also mount other formats I don't know. /Rab