Oh I can convert A4 to A0 all day long, it's the printing bit I have an issue with.
Storage wise also good - I use large format expanding envelopes for my pattern pieces and notes which works really well. It's just a pain printing out 70 sheets of paper, sticking them together and then cutting them out when I have such little table space. I'd rather pay £5 for an A0 sheet or two to cut out! Especially when a friend asks if I can make them a whatever and I have to print out another 70 sheets for another size! I don't mind them for small things like bags or bodices as those are normally no more than ten pages but the skirts and trousers are infuriating! Such a time waste