It all depends on what you think of as slick. I think it is pretty slick to be able to schedule a recording on my office PC and start watching it later on my HTPC. I think it is pretty slick for my wife to be able to setup a recording on her computer while I'm watching a football game. I think it would be slick if I set up a small, all-in-one, touchscreen computer in the kitchen so we can set up recordings there. I doubt anyone has written a program for it yet, but it is entirely conceivable to be able to use your iPhone to setup a recording.
The point is that the HDHR is the least intrusive, most versatile, and easiest to use tuners I've run across. I'm simply suggesting you think of ways it might fit in your home. Having a single program or platform for both recording and playback may look like a great idea, but it might not actually be the best solution. Or then again, maybe it is for you.
I've a friend who just setup XBMC in Unbuntu so he could use GPU acceleration and he is thrilled with it. I was over at his house just for a few minutes yesterday and he showed me what it can do. I can certainly understand why you'd want to use it!