I purchased a Motorola TK30 Cat Kit the other day. Like the T605, the street prices for these have dropped dramatically. I bought mine for under $60 new in box (list was $299) from Amazon.
This looks like a sweet unit. You can read the owners manual here. I bought this to go in either the XJ8L or the X-Type. It turns out the X-Type has premium sound so the install there would be very difficult and significantly reduce the audio quality. My XJ8L however has the standard sound system so I ordered the ISO harness from England to install the system in that car. Should require no wire modifications. Just connecting to existing wiring. I will do a fill writeup when I am done with that install.
Anyway, back to the unboxing. Here is what the system looks like inside the control module.