So! I tried my hand with 3D Coat's UV Mapping system...
...and holy boopsie. o_O
It has to be the best UV Mapping system I've used so far, beating some of the dedicated professional UV Mapping tools I have trialed.
It needs to be noted that I'm one of those pervs who actually like UV Mapping (because it is like one big puzzle to unravel, and watching things go squishy-splat is kinda fun); 'till now, I've mostly used Hexagon's UV Mapping system as my main go-to system, but I have also tried things like UVLayout and Roadkill etc.
The system is pretty intuitive (I didn't need to read the manual to get hang of it, just for a single-layer not-so-simple object to UV map -- pretty sure I should read it more closely, since I should turn that UV map into multilayer one instead), and fast. Things flatten neatly, and I feel that if I need to mess with a detail or three afterward, I can either tune it up in 3D Coat or tweak some points in Hexagon.
So if you're on fence about 3D Coat, but suspect that you might need an easy-to-use and understand UV mapping capability in near future, then I can totally recommend it for your UV mapping needs.