I was using a kitchen table chair and then a folding chair for years. Just bought a Horn chair last month - LQS had a sale. It was the best buy I could make. Love it. Sewing is much more comfortable. The wheels are great. I love to just sit it when I crochet or knit and watch TV.
Most important thing - try it out. The store also had Koala and another brand. All were basically same price - but the Horn fit my body the best.