More Than a Great First Impression.
If you're a "one man (or woman) band" and your NOT in an industry where customers expect you to be on your own (such as an independent insurance agent) then chances are you probably don't want to broadcast that fact to customers.
Getting a professional Virtual Office Solution is an excellent solution, BUT, if you record all of your company's prompts (i.e. your company greeting, menu of options and various mailboxes) then your voice is the only voice your callers will ever hear.
Chances are they will quickly put together that you're it - possibly giving them some concern as to your stability, longevity or ability to deliver.
Having professionally recorded voice prompts on your system not only provides a great first impression but they also alleviate unnecessary concerns as to your size or capabilities.