I went with the ugly, heavy duty, GIVI setup simply because I already had a big givi box. I'm not entirely thrilled with it.
Quite frankly, I have a concern on how to get to the rear turnsignals should I ever need to replace a bulb. One look at the supports and I wonder If I'm going to have to disassemble half the bike just to get the rear cover off.
Anyhow, I've seen some Xcitings where they just mount the givi plate without the supports. I personally wouldn't do that for fear that the whole mess will fall off when you hit a good bump with a loaded box. Yesterday I stopped by Walmart and had to buy a big box of cat litter. That weighed 9.7kg which is something like 20lbs? That kind of weight already is beyond the 5kg load limit of the monolock boxes. I wouldn't even attempt it without the beefier supports.
If I ever go to a different box, SHAD or COOCASE will get a serious look.