Good article. I worked out of my house for several years before renting an office suite. Renting the new space was the best move that I could have made. I think it gave me a much more professional image because all of a sudden, I could see a big difference in how my clients and potential clients were responding and treating me.
And, in this economy, there are a LOT of great office spaces for rent at bargain basement prices.
My advice, if you are looking to rent a space....do it and don't be afraid to negotiate HARD...chances are very good that you will get the deal (ie the space) that you want and need at a REALLY good price.