Share 'Anyone experience with the Yudu screen printing kit?'

I'm interested in knowing if any of you have had experience, good or bad, with the Yudu screen printing kits that can be found in art/craft shops these days? I'd expecially like to hear if you have had experience with both the Yudu and the Gocco--a comparison of the two! I've seen this set of videos: http://www.whatdoyudu.com/videos/default.aspx?id=3 and wondered if this would be good to use t…