The installation of guest OS was smooth and interface is nicely designed as in other Mac applications. It was nearly an unattended installation (e.g. no question asked about FAT/NTFS format for the HDD and VMware Tools were installed automatically once XP installation was done) and it was faster than what I did earlier on my PC with C2D 6420 + 2 Gb RAM.
Too bad I found that no settings were available for display resolution (I could adjust that in guest OS whereas for VMware workstation I have to do that before starting XP Pro) and no dual monitor support. VMware Communities confirm this feature isn't available yet.
The 'unity' feature looks weird but could be useful. It's like blending spaghetti with noddle.