I first tried out the service a year ago and didn't end up keeping it for too long. Now that they have 18 Mbit internet I tried it again. I also was tired of having my DISH sat on a tripod on the patio with cables running through the sliding doors (Apartment complex).
The HD quality has definitely increased since I first tried it out, however, it's still nowhere near satellite service HD quality. You mainly notice it when looking at fine details on a person's face, or in really high motion events. I'll survive with the lower quality HD for now, at least, although I wish they would up the bandwidth a bit.
I have the 2HD/2SD streams, and the installer said they were switching to 3HD eventually, although he had no idea on a date. My max rate is 60 Mbit, so the bandwidth is there, at least.
The internet connection works fine, and latency is surprisingly not too bad, I tried out some gaming on the xbox and didn't notice the lag. Last time I had the service it was tons better switching to cable internet.
The set top boxes work perfectly, although I'm still rather annoyed that I can't use HDMI on them due to that bug. Having to do a full reset of the receiver every time I turn it off of standby is not my idea of a good time. Being able to watch shows streamed from the DVR in other rooms is awesome, and we've been using it every night since we got the service. All our receivers are hooked up with cat5, the installer made use of my existing gigabit network I have in the place.
All in all, I'm happy. Good functionality, a clear patio again, and decent service. Hoping the HD quality will take an upturn some day, and also hoping they get the Viacom networks added soon, so I can get some Comedy Central in HD!