I've had the HR21 for about a year now. I switched from a standard def DirecTiVo and noticed that the interface was MUCH slower. I chalked this up to the increase in quality to HD, and it wasn't so bad that I wanted to do anything about it. The harddrive failed maybe a month in and it was replaced with a new unit, still an HR21 though. I was hoping the performance would improve, btu no luck. I have been living witht his for the past year or so. My question is, if I were to upgrade to an HR24, would I notice a significant increase in performance? I know the HR24 is a lot better, but will the speed increase significantly? Just doing due diligence before I shell out the $200. I was considering just waiting for the new DirecTiVo's, but at this point that sounds like it will be along wait.