I will say this. I got very lucky during two tech visits and ended up with two HR-24's that were no refurbs. I was kind of shocked. So now I have one HR-21 and two HR-24's. The 24's are so much better! Very little to NO lag whatsoever on both of them. Reboot is about twice as fast as well it seems to me. It reminds me of when I had DISH a few years ago as their DVR speeds were great.