The people who's kings slip have not bedded them in properly. I could buy a profile hub for my bike and put on my bike upsidedown/back to front and come on here saying "profiles are f**king shit, dont get one they just dont work"
its the same thing as not bedding a king in properly.
And its the same for everything. Im not saying one is better than the other, but to me a well set up king (which isnt hard) will be more reliable and last longer than a profile on a stock.
For mod I say profile, a little heavy but by far and away the cheaper and I dont think you will have problems with it.