I've only had one client use google voice because his cell phone was his work phone. The only problem was when I was on my way out and was checking to make sure I was going the right way he never answered and I had to wait for him to call back. But I'll be in Phoenix next week and as long as all other info checks out it shouldn't be a problem.

although I see the appeal of using the google voice its sometimes a pain and some girls are weary of it, I know I have been in the past. but IMO as long as your able to be verified by other means you shouldnt have too many problems