Hey All, So i've been trying to find some information regarding the two different units, or reviews between the two on Youtube, and have come up trumps. I was wondering if anyone could enlighten me on the difference between the two units? I've recently lost my X3 Pro in a house fire, and am looking to replace it with the HD Pro. I found a few used on local buy and sells, but they're only the standard HD Pro's. If it's worth getting the X, What are the reasons behind it? Thanks in advance! Chris.