I've only tried the ghetto tubeless. I was happy with it untill I had a hole in my rear tire that didn't reseal and sprayed the latex up my ass and back. The stuff doesn't wash out very well so I went back to tubes because I didn't want to wreck any more of my riding gear (well not realy wrecked but it always looks really dirty even when clean).
I don't think that this is a problem with propper tubeless setups. AS far as I understand it, the propper tubeless tires and rims don't need any liquid latex, Slime, Stans or any other sealing type of goop to work.