I bought my PC at Coastal Tool as well. If you're a clean car fanatic, it is an indispensable tool. Doing a full detail on a vehicle, especially a large vehicle like a BMW SAV can be excruciatingly tedious and tiring. Assuming you're going to wash, clay, and apply a couple of layers of professional detail products, it's no fun doing it by hand. The PC cuts down the time to apply the glaze, wax, and sealant. It allows me to do a complete detail on my X5 and my wife's E46 in about 6 hours including beer breaks. Without the PC, 1 car by hand per day was my max.

To make it relative, the PC costs 2 tanks of gas. It's a worthwhile investment. Make sure you invest in a good set of buffing pads.