I have three of the Dymo LabelWriter's in use at all times. I have never had one problem with any of them. I hope I didn't just jinx myself. Fantastic product. They need to bring back the 450 twin turbo.
Demo needs some serious overhaul of its software and user instructions. I have been in tech support myself for many years, but making a Demo Label printer work out of the box, if ever, is nigh impossible.