Yes. Honesty and transparency will actually go further in the long run.
I have never had a problem acquiring or maintaining clients using words like I, me, and mine instead of us, we, and our.
I use a single email address for all support issues instead of various email addresses for different subjects such as sales, billing, support, etc.
I don't charge them $500 to run their site through Google Webmaster tools to optimize their website and claim to be an SEO expert.
I don't pretend to own a server or data center to host client websites when in reality, they are on my rented hosted plan or server.
I don't offer the moon. I tell them I don't know but can find a solution. Clients are usually satisfied with that and I earned their trust, as well as their money, while offering a professional service.
CoffeeCup... Yeah, they are the best!