Sparksd, can you send me link for your wireless file hub? Thanks.
The WD MyPassport Wireless does wifi N with dual bands and has a integrated SD reader. I think it would be the fastest wifi drive to do things like move photos from iPad. Also it can be a wifi hub and hotspot. It seems as if you have to jailbreak an iPad to get it to read and write with a Lighting to USB connected hard drive.
But isn't the USB port USB 2, not USB 3? I know, I want mission impossible.....AC wifi and USB 3 ports.
At least one 128GB SD card worth per day on a multi day trip. I need to cull and download every day. I don't want a minute wasted on moving the culled images to the hard drive.
I do not want the size and weight of my rMBP in the field. We hated carrying those around for 3 weeks in Kenya in November. We head to Lake Clark in August and do not want the rMBPs with us for that trip.
While the WD MyPassport Wireless looked like a viable candidate, it does not do dual band AC spec wifi. But the iDrive One product does do dual band AC wifi. Their IOS app will like you download all your IOS photo and video files to the device. You can get the device with either HD or SSD. And it looks like a cheaper price than the WD product. The downside of the iDrive One is that it does not have a battery. So you have to power it via USB to make it work. Personally I find that OK. I just may purchase one and experiment with it.
IDrive® One - Personal Cloud for Backup and Streaming
https://www.idrive.com/one/idriveone-quick-start-guide.pdf
IDrive One on the App Store
If you want to copy from card to drive, them the MyPassport Wireless can make sense. But, I want to cull before saving so I need to import to iPad Pro 12" (supports USB 3 speed). Then I can cull and send the keepers via wifi AC to the iDrive One. Once I get the equipment I experiment on how long it takes to upload a full 128GB card and how long to wifi them to iDrive One. It is very sad you have to jailbreak an iPad to get it to copy files directly to a drive connected via USB.