There are a great many missing features compared to the V6\TiVo boxes, a number of which are TiVo patents so unlikely to ever appear, also the 360 box has been out for several years now and in use in other countries for some time before that, so don't expect any great changes. The pooling of recordings is actually something I see complained about quite a lot, rather than being a benefit, as in a house hold with multiple people with their own boxes (i.e. parents and older children) it means that everyone's recordings get mixed in together, and also if one person deletes a recording it's gone for everyone (and can't be recovered because there is no undelete option), so you need to be very careful if different people are watching the same program. I would have thought the profiles would have been used to control this, everyone having their own list of recordings and programs only being fully deleted when everyone deleted their copy, but it seems profiles are really just for targeted advertising.
Some of the other missing features are as follows; Wishlists (where you can set the box to record programs on certain subjects or featuring certain people), undelete, series link+, series link manager, suggestions, setting of series links for programs not in the current TV guide, ethernet control, keyboard support via USB, switching between tuners with constant buffering, skip-back on fast-forward, quickplay, default recording options, cancelling individual recordings from a series link, multi-channel series links, radio channels allowing recording of radio, separation of recordings between boxes, watching recordings when internet is not available and probably a few others I've forgotten.
Also, extra boxes do not have their own hard disks or tuners (unless converted from a V6 box), so you lose storage space and recording ability and are also reliant on the main box being on to watch and set recordings and also on having a decent wi-fi signal (or ethernet cable) between the two boxes when watching recordings.
