Really, except for the NUMBER OF CHANNELS and BACKLIGHT options, it would be trivial to add the newer models.
XT: Up to 25,000 channels, multi-color backlight / white key BL.
996P2: Up to 25,000 channels, multi-color backlight / white key BL.
BCD536HP: Unlimited channels (up to card capacity), white backlight / white key BL. Multi-color alert light.
Maybe that's why it hasn't been updated. Not a whole lot different based on the listed categories.
But, for 536 additional features over the XT/P2 line:
The x36 series has things such as:
* Recording and replay capabilities built-in
* Display of much longer text tags
* System/Department/Site/Channel hold keys to quickly hold.
* Much improved alert light
* Much improved DMA memory - allows nearly unlimited data
* Zip code entry (for selecting what you scan)
* Selectable range entry
* Holds the entire USA RR database
* 100 Department/Site Quick Keys (up from 10 Group Quick Keys)
* 100 Favorite List Quick Keys for quick changing of multiple Systems
Many of these features are not even on the comparison matrix.