Once you allocate hard disk, RAM, video memory and ports to your guest OS, VMware Fusion trues to keep everything balanced. VMware Fusion manages system resources very well. Installing a virtual machine is more complex than installing a normal app and VMware Fusion does a good job of walking you through it.
The program itself installs quickly and contains a very good setup wizard for both the program and the VM itself. It is fully supported, has good documentation and a very active community.
It is a fully featured virtualization program that offers a lot of features for the money. VMware Fusion costs $79.99 for unlimited installations and is the little brother of VMware Pro.