My son in law copied my version 8 discs for me (apparently it is a special system that is required, not just a basic disc copy as with data discs plus high double density discs etc) I have supplied a half dozen members with disc sets if you want some, just PM me your name, address and I ask for $10.00 to cover disc and postage costs from Canada. Only one member had issues with the discs, dont remember how that worked out, if it was his unit etc or the discs.
BTW. the difference between the east and west disc is that the POI's (Point of Interests) for the west is not included on the east and visa versa: just the maps. The POI's take up lots of space etc.
I have not tried the Toyota set. I dont bother with voice commands and for that matter, when traveling afar I bring a Garmin. If you have a big display cell phone and an unlimited data plan you are all set.
None the less: If you are like me, you want your gadgets to work correctly. The 2009 discs/version 8 were finalized in 2008. Most the major routes have not changed, roads get widened etc. It is the new roads or developments that are not there.
I love my car as I am sure everyone here does: and likewise most of us love Cadillac's. It truly sucks that Cadillac does not love us back by supporting our needs.