I installed the DNX6990HD without significant difficulty and it works. Wiring was exactly the same as described in your excellent guide. Crutchfield included a Boyo backup cam which went in with 1/2" of spare cable and also works fine. Startup time for the 6990 is about 20 seconds, although the camera is available immediately which I hadn't expected. The bluetooth system is not what I expected; I removed a 6 year old Parrot system as part of the install which downloaded my phonebook and had a bunch of features. The Parrot bluetooth in the 6990 has a fairly limited list of phones that get all the features, and mine is not one of them. So no phonebook download and few features. I miss getting caller id names for people in my phonebook, but don't use the phone much anyway so it is not a huge issue. Good sound quality though. The only real disappointment is the Scosche kit. The side trim pieces don't really come close to the finish on the stock parts, and like others have mentioned make up for that by not fitting well. The lower compartment screw holes were slightly out of alignment which turned out not to matter since I couldn't get the little door to close over it anyway. I gave up and went back to the stock compartment which works fine. So I ended up with a wiring harness and a couple of trim pieces for which $17 seemed a bit steep. But the trim is not particularly noticeable and the harness worked once I did the resistor mod, so my annoyance level stayed fairly low. The 6990 has a "security" feature which, if I read the manual correctly, flashes a red light on the front panel. There is no anti-theft system; just a flashing red light. Since I assume that every radio thief in the world knows that a flashing red light on a Kenwood radio means nothing I can only assume that it flashes to lull me into thinking that my radio is safe if I didn't bother to read the manual. I had a little laugh about this and turned the light off. Maybe I'm wrong here about either the radio or radio thieves and somebody will correct me.