This is a great site to get RPM's
How do I add them and remove them???
If you are saving from the internet, then you choose the RPM you want, right click and save to your hard
drive. Your system should recognize and install for you. Here is another site that may answer more of your questions.
How do they compare with other software???
The biggest difference is that RPM's are free!!! However, in your quest for
the perfect RPM, don't get into a hurry. To find good stuff you have to
search and that can take some time.