I use a PC at work and MACs at home. I have a G5 I bought in December of '03 (using it right now) and I have not had one problem with it. On the rare occasion that something locks up, you just do a force quit and everything is OK. I also have a 2 year old mac laptop - no problems there either. My work PC's are another story. I am on my third laptop in 5 years. I also have changed out 3-4 hard drives in that time as well. My work (PC) laptop rarely leaves its docking station, but my Macs get used daily by my three sons, so I know my Macs are exposed to a tougher environment than my PC.
Like anything new, there is a learning curve, but it is very short. Once you get used to a Mac, you'll love it.