I would like to hear everyone's opinion on fly shuttles. Are they primarily used to weave widths that are wider than your arms can reach or is it that you can weave much faster? If it's the latter, how much time do you think you save using a fly shuttle versus a regular one? I would like to hear the pros and cons. I'm looking in to buying one or more for my looms and wondered if I could get some help?. Thanks.