I've been using Mr Tuffy for a couple years now, and I guess I'm in the half that has never had any problem with the ends abrading the tube. They work great, they're cheap (a lot cheaper than the price bump for a quality flat-resistant tire, and you can move them from tire to tire indefinitely). In theory (in actuality) they add a weight penalty, and at the worst-possible place, the outer edge of wheel rotation. But in practice, only weight weenies would really care.

As for Stan's etc, I was wondering the other day why the mech forum hardly ever gets questions about stan's or homebrew tubeless conversions. I think maybe there's a practical upper limit to the PSI that stan's is good for, so you'd want to be running pretty wide tires (40-45 and up?) at relatively low pressures (40-45 and down?)