Skennelly is 110% right. Rooting does no damage. Recovery images are in place for disaster recovery. And, that's why you made backups. Flashing ROMs is where the risk comes in, but if you read, read, read, and be patient, there will be no problems. Ppl are here who are willing to help you in case something does go wrong.
Now, I'm all for rooting. But, it all depends on who you are and what your preferences are. Rooting and flashing ROMs will allow extra functionality to your phone, depending on what ROM you choose to flash. Again, that's where reading and doing your research comes in.