I have all the big name brands as well (been buying radios since I got into ham when I was like 7...) and I will never argue that these are in the same realm. However, as you mentioned, for the price I can stash a pile of these with the batteries removed and in a metal container, and they will likely survive even an EMP type of SHTF scenario. I now have my better radios for personal/family, and cheaper radios that I can hand out to folks as our plans unfold and a number of groups link up and head to BFE.
Any of the FTDI cables, like the one I linked, will work just fine with windows and mac (I think linux as well, but I honestly haven't tried... I have an rdp linux machine if someone needs me to try it)...
Yep. I have a handful of them already, and just bought a few more to stash. Upgraded antennas, a couple of 25W truck radios that cover the same bands (playing with a solar powered, "drop" repeater for SHTF), batteries, etc... I've spent more than a few dollars with china on these...