It can be customised to your tastes and needs, often at no extra cost; try telling a department store that you really want a blue one if they don't stock it! It may be one-of-a-kind or part of a limited run,...
Before purchasing it is always good to check your sellers feedback. If their thread is very slow to sell it will often mean that it is stale and stale thread means that it will be weak and break often. Check...