After holding off for a long time, I finally retired my HR10-250 TiVo. I was pretty apprehensive about the switch, but my fears subsided after lurking here for some time. Just a few hours down the road here I have to say that I really like the HR21-700. Its features seem to exceed the HR10-250 by a mile. I'm sure I'll be fumbling a little with the new menus, but so far, it is great. I did start out by purchasing an Antec MX-1 and a 750GB Western Digital drive. I have to thank the users of this forum for leading me to this addition. It worked right from the beginning. All in all, the whole installation and the programming of my MX-850 remote was seamless. I'm just hoping that I don't wind up posting any future problems. Thank you all for the help I received on this forum.