I installed the unit over the weekend (in an '05 GX470 with ML/Nav/DVD). Realy easy, following Darylhuff's instruction. Hardest part, or should I say scariest part was to remove the 2 wood trim pieces on the center console. They're on very tight, so when you try to remove them, you have a feeling that they're going to break. But they'll come off with a little force.
There are a few problems that I'm experiencing since the installation. Thought I would report them here to share with others...
1. My navigation went 'whacko' after everything is installed. It told me that I'm at one place, where I'm really about 15 miles away. I panicked at first, but then just went into the Setup screen to calibrate it. So I have to move the arrow to where I really was, and then set it. Ever since, the Nav seems to be OK. No more problem. Has to be the XM antenna intefering with the Nav system. BTW, I put the antenna in the rear of the car (on roof)
2. While listening to XM, say I pulled into my garage and turn off the engine. The next day I started the car, the radio will be silence (I think it's because there's no sat signal while I'm in my garage). I have to pull out of the garage, drive for about 1-2 minutes before I get sound. A quicker way would be to change to a different channel as soon as I back out of the garage, then I'll get sound in about 15-20 seconds.
3. Similar to issue # 2, but this time I'm drving and listening to XM radio. Then I decide to switch to either AM or FM or CD. After a few minutes, I decide to switch back to XM. Again, dead silence for 1-2 minutes before the sound returns. Or I just change to a different channel, and will get sound in about 15-20 seconds.
4. The manual shows you how to save presets (favorite stations), but it does not seem to be working very well. Everytime I save a few presets, it seems to erase all previous ones. No big deal, just kind of annoying.
Other than #2 and #3, which are bugging me, the unit works as described. Sounds great, very easy to use (integrated well with the Nav/Radio system). I strongly recommend it to all Lexus owners out there that want XM.
Cheers,