71chevelle - Basically, what blkZ28Conv said
I WILL, however throw out a few caveats. The PC is REALLY just a "fast hand" that doesn't get tired/careless/sloppy (but the PC's USER still can). It's NOT like a rotary, where you can actually DO things that you CAN'T really do by hand (rotary= heat + speed = different, and risky). And it's not QUITE as simple to get eye-popping results with as some might make it sound. It IS pretty foolproof, though; you won't hurt your car with it. The "problem" is usually that someone spends (what seems like) forever without getting the swirls/scratches out NEARLY as quickly/easily as they expected to.
I probably couldn't get by without my random orbitals, even use them to apply paste wax (!), but I want you to have realistic expectations. Yes, you'll probably see a marked improvement in your car, and I say get one. Lynn just used a PC to do her car for the first time and she LOVED it. Get plenty of different pads and put some real thought into the polishes/compounds you buy (some work a LOT better/easier than others).