Pleasant stationery that follows your graphic profile is a good investment. A letterhead with your logo, for example, will mean the reader gets a visual reminder one further time of your company name. And isn’t it a lot nicer to get a real letter on good paper instead of a simple email, for example?
Letter paper is often printed in large series and then used in an office printer so it’s perfectly suitable for offset printing.
It can be worth laying out for a slightly finer letter paper. It raises not only the feel of what you post but also the overall impression of your business.