Has anyone done this? Your experience would be invaluable to hear about it.
I have been doing this since 2010. I am posting this very reply on TBN right now from way out in the woods over a Wilson setup, using my iPhone as a wifi hotspot. I have the Wilson SOHO 65 booster receiving signal from a (focused) Wilson YAGI antenna that is aimed at a cell-tower about 8 miles away. There is a mountain 400 feet higher between me and the tower, so this signal is going over the mountain to get to my YAGI antenna. It is not line-of-sight. Once I figured out where the celltowers were, and pointed the YAGI at it, things worked MUCH better. A YAGI antenna is about $60. Also I put the amplifier near to the receiving antenna, and PUSH the signal to the re-radiating antenna, over 100 feet of low-loss cable.
My signal, with no booster, is zero to 2 bars. It does not support internet. I have found that I need 3 bars to get any internet, and 4 is where is becomes useful. With the booster, it's a reliable 4 to 5 bars. I'd say it works quite well. Youtube comes in pretty slow.
I have an iPhone 4S, so I have ATT's "4G", which is just 3G with a partial woody. ATT calls it 4G because there are no standards for Cell signal naming conventions, and Verizon got 4G ahead of ATT, so for a couple years ATT just called their 3G ----> 4G. Now ATT has a true "4G" which they call "4G LTE". I don't know if I can get 4G LTE out here, but I'd sure like to know. When I go ontop of the mountain (400ft higher) my daughter's iPhone5 picks up 4G LTE. But the SOHO 65 does not boost 4G LTE. I would very much like to borrow a 4G LTE booster and test it. For that I'm in the same boat as you. Wish you could tell me something about the DBPro --- my stuff is about 4 years old.
FWIW I climbed up in a tree 40 feet and my signal was weaker than at 20 feet high. So YMMV. I think you'd have to be quite the radio-wave expert to be able to assume how a wave is going to bounce around enroute to your antenna. Note that trees will block cell signal. I have found Wilson techsupport (call them on the phone) to be very, very good.