An investment in a good office chair is good for comfort and good for your body.
Tempted to use an extra dining room or folding chair at your desk and computer? Don't! Tempted to finally buy that overstuffed leather executive chair to sit in while you keyboard? Watch out! Your backside and your back will regret these choices.
You can still cause damage to your back, neck, shoulders and wrists even while using the computer in the family room! You'll be more comfortable if you invest a little money into a desk chair.