I have used Alcohol 120% past 2 years and found it very helpful in creating the images of files and then to run them at the time of need by installing Daemon tools.If the need arises that the software or game does not run without CD then just create its image file and insert in the virtual drive and run it.You always have a solution of problems in computer world.
I've used Alchohol 120% before. It's a decent program. I like the interface but, if I remember correctly, it doesn't have many features. It just creates and burns file images. Great for burning games in a rush though.