So far I haven't had any issues whatsoever with Dtube. No buffering issues or anything. I think the growth potential is incredible. A much larger % of people would much prefer to watch vs read, so I think it compliments Steemit beautifully. Zappl will only add to the overall platform value of Steemit. The only drawback I see as of yet is copyright law being violated quite a bit. This can cause nothing but problems down the road and the sooner this is addressed the better.