Justice Yeldham definitely fits in my book, since he does seem to abandon anything like composition in favour of just harsh sound. I've still not seem him live unfortunately though so I can't say for sure, I'm just basing that on the little I've seen on the internet.
For me harsh noise can be great live but I almost never sit down and listen to it at home. Often it seems to straddle the line between musical performance and performance art, and Yeldham seems a good example of that. Kylie Minoise as well, with his effects pedals strapped to his body and unpredictable antics. I've seen Filthy Turd do some great things with attaching a contact mic to a cymbal, filling it with lighter fluid, setting it alight and then playing it. Not safe of course, but if you want safe then noise is not the place for you. I'm rather sorry I missed the gig Smell & Quim played not too long ago as well, apparently it was highly ridiculous and their remix on the Stalingrad album (I think it's of Hanged Man Will Repent) is satisfyingly brutalising. I've also got a soft spot for Sickness, I think the only harsh noise artist who I liked enoughlive to risk buying a CD. He had contact mics hooked up to big blocks of metal he slammed around while he manipulated the signal through a table of effects pedals. As a performance it was great but I have to admit I've only played the album a couple of times.