After two weeks of using costar, I decided to get a Sony box and give it a test drive. My main reason was the lack of support for AC3 files on costar, since all my home videos on my network are AC3 files. Please don't take my comments as a bash, I like costar and despite my following comments I believe for the price point costar is a great device. Here are my thoughts: Look and feel: No question about it, Sony has much better built quality. It has more ports, and the power light in front of the unit. That light takes away all the frustration regarding the unit's on/off status. The unit is about twice as big as costar, although it is not as thick as costar. Remote: If I decide to keep the Sony box, it will be all because of the remote (assuming costar fixes AC3 issue). The remote is the main differentiating point between these two products. It looks better, the built quality is better, and it works better. There are some areas where costar remote wins. It is almost half the size, although it is wider. It has fewer keys, no shortcuts for apps, no dialer on the front, but it covers everything that you would expect from a universal/GTV remote. It has backlit, and an amazing pad with tactile feedback, so it never misses registering your push. There are only two draw backs, one, believe it or not, holding it is not as comfortable as holding costar remote. It has somehow sharp edges, and it is little too wide. The other problem is the directional key. It is not as smooth as costars (it is smaller) and since it is right above the pad, your tomb keeps touching the pad when you push the down directional key. One other difference is that the IR blasted is next to the box, rather than built-in like costar's. Everything else works the same as costar's remote. Setting it up was even easier than costar's; I didn't have to manually enter my DVR model, and few other things that made it easier. Also in order to get video pass through for my dvr, I can set the unit to standby and I don't have to keep it always on. The application layout is different; it is at the bottom of the screen, which feels like a more logical choice to me. Apps are almost identical. Few extra apps that none of them are that amazing. I found the software a little snappier. Streaming experience is almost identical; I have exactly the same problems with some of my files running from the network. Although it feels that with those files, I get slightly less buffering. The box also has a larger onboard memory, 8GB, vs 4GB on costar. Browsing and flash experience is identical. I didn't feel any difference. And most importantly, the box streams AC3 files with no problem what so ever. One major problem that I have with the Sony box is that my external USB hard drive is not working with Sony box. I had no problem using my hard drive with costar, so I have no idea why the hard drive is not working. Lastly, I get almost the same number of force close errors on Sony box. One app that I got few errors with was the live TV app. Overall, I like Sony's box, especially the remote, better. But I don't think that it is $100 (or 2x) better. They both do exactly the same thing, with a slightly different user experience. If Vizio fixes the AC3 issue, most probably I would keep it, only because of the cost. Sony's box is a great product, if costar was priced at $150, or Sony's box was priced at $150, I would have definitely choose Sony over costar, but with these price points, it is hard to justify buying Sony's box. I am going to keep them for another two weeks before my Vizio box's 30 days is over, and I will keep posting about my experience here.