Using Compression for Backups

I have a Quantum DLT 4000 tape drive that is 15 GB/30 GB depending on whether or not you enable compression. I can enable it using the ARCServeIT software or by adjusting the settings on the backup drive itself.

I could, of course get more storage space by using compression, but I’m not sure if it is the best thing to do. Someone told me once that compression wasn’t as reliable and it wears out the backup tapes sooner than if you don’t use it.

Can someone verify this for me and tell me whether or not software compression works better than hardware?

Sorry, I don’t have anymore points to give. This question took my last 20.