I bought the mesh back support that goes on your regular chair back. I find that the added curve in the back forces me to sit straighter and not slouch. I also bought the magnifying glass set for my Bernina for FMQ so I don't bend forward to see where I'm sewing. I would love to upgrade to the ergonomic cutter that fits into a rail on the rulers but I can't justify the price or the waste. I would have to buy the new rulers and I have a fairly large collection of regular rulers already.