I have been using pc for over 10 years now and find the pc is just full of virus's and maleware. I have converted to mac and never looked back. The mac is much more reliable and does not have a lot of virus's. I have a stucent version of mac autocad and will soon buy a complete copy. I am an engineer in private practice and still use the pc right now, but plan to switch to mac autocad soon. There is a slight learning curve with the mac version, but when you learn it, it is basically the same, except with the mac panache.