Pros and cons of using a portable bobbin winder, please? A friend of a friend suggested (strongly) that one should invest in a portable bobbin winder. She said that if would save my machine by not using that feature and then I wouldn't have to stop whatever I am working on if I run out of bobbin thread to thread new bobbins. (I usually keep at least 6 bobbins with the color thread for the project I am currently sewing). I have been reading a lot of posts on different gadgets and am trying not to buy everything that sounds so darn good! Besides, I just don't have the storage space for every little gadget that might only get used once or twice. Thanks, ya'll!!!