There is at least one other member with a white Bestem 2012 mounted to his/her Honda OEM rack. The white one seems to match closely as well to the white CTX. They also make a black one, but I've not seen a picture of a CTX in black with the Bestem Black 2012 case.
Out of a matter of principle, I refuse to pay a lot for luggage. If you're looking for decent that is cheap, this a good way to go. The only issue is going cheap on a rack and supports. That's where I got stuck, but mounting to the seat gives me the advantage of a back rest when I decide sit back, and I haven't yet had the opportunity to talk anyone into going two up, so that's not an issue for me, but if my mounting system goes as I hope (maybe x large dog collars with quick disconnects), easy removal and reinstall will be part of my system.