I had the RVU set up for my 4K tv so I could watch VOD 4K, which worked, but always seemed clunky, channels changed so slowly, and my Samsung UN55JU6700 never seemed to like it. I recently had the new HR54 installed, and because of some faulty advice from the directv installer, was told wrongly that I didn't need RVU anymore because HR54 could handle 4K on its own. After a week of arguing with Directv, I realize that isn't the case now, and they are offering to come fix it so it is ready for live 4K (when it happens). Anyone used both RVU and C61K and have an opinion of which experience is better? Does the C61K change channels quicker? Does one choice or the other future proof my set up better than the other?