I have used the Sony CD-RW disks before. I mostly use them to save web site files for the web sites taht I design and update. I like the RW disks for these files because the RW disks can be rewritten on. It's easy to update a web page and then just rewrite the new files over the old ones on the disk.
The disks I use can hold 650 MB of data or 74 minutes of music or video (depending on the size of your music or video files).
They are fairly reliable disks. I have never had on NOT write for me but they can be a little iffy when it comes to rewritting or deleting the files that you already have on the disk. I've had the disk tell me that it is full when I know for a fact it is not. I have also had the disk not delete some files whe I tried to empty a disk for a new project. These issues have only come up once or twice in the last few years that I have been using these disks. Other then those small issues I have not had too much trouble out of these disks. If I had more trouble I would not keep using them.
I usually buy the 5 pack of disks. They each come in their own plastic case so there is no accidental scratching from shipment or rubbing up against other disks int he package. The case also gives an easy way to store the disk after it has been written on.
Over all these are fairly reliable disks and easy to use. They come in handy for small and large projectsand I will continue to use the Sony CD-RW disks for my project storage.