I recently added a Sony PMW-300K to my family. Given the successful adoption of the Sony EX3 and the XDCAM EX workflow among so many production companies, I felt that the 300 is a logical investment.
As a freelance cameraman, being an owner/operator is very beneficial not only to me, but to my clients. When shooting with my own gear, I know the ins and out of every piece of kit. When I show up for a commercial, or corporate video shoot with my gear, I know that I have everything I need to get the job done. I also know that it works.
Many times in this industry, renting is the only option. Some cameras lights, and equipment are just too expensive or large to own. I don't mind renting, but it is nice to avoid the hassle of showing up at a rental house the day before a shoot to check out gear.