VMware Workstation - Why Sysprep?

I am using VMware Workstation 7 for Lab Training and Testing and I plan on using some base client installs for creating clones (fully patched, etc.).  I'll be using XP/Vista/7 for clients in different 2003/2008 Domains.  I have never had to use "Sysprep" in the past and it seems like a waste of time for my specific purpose.  I can rename the workstations before I join them to my domains so my questions is simple:

If VMware Workstation already creates a new MAC Address and the machines are cloned from a fresh "Workgroup" install then should I even bother with "Sysprep" on the machines before I clone them for testing?
ZillaTechAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
If you plan on testing something you intend to put in production it's unwise to use shortcuts.

MAC addresses don't have much to do with SysPrep.  It was commonly thought you needed it to reset the SID, but this was essentially untrue as reported by Mark Russinovich.  That said, there are potential issues with some services, such as WSUS, if you don't properly prepare the system using sysprep.  Unfortunately, you just don't know what else it would effect.

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ZillaTechAuthor Commented:
In my case, I will never put these VM's into a production environment.  This is strictly a testing lab for training.
Lee W, MVPTechnology and Business Process AdvisorCommented:
I'm not sure what else I can add... you know my opinion.
ZillaTechAuthor Commented:
Fair enough, I was just hoping to save some time is all, thanks for commenting.
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