In the following article “David Pogue Reviews the New Mac Pro” David Pogue finds the Mac Pro stunningly fast but for certain activities that it can take advantage of. Some things actually will run faster on an iMac
such as launching Parallels desktop than on a Mac Pro.
This is important to know as this is a very expensive machine. If your expectations are that this computer will run rings around say you current iMac you might be in for a bit of a shock.