I just got one. I am not too sure about the similarity of installing this MB-VI vs. the CD400, but I used the How-to that Pnsji wrote as a guideline to help me with my install. It is very similar in certain ways, and it definitely helped that I had some sort of reference (as well as my numerous emails to other Member's).
I've had in in for a few days, and here is my take so far:
Install was not too bad. There is alot of stuff going on there, so making sure you are wiring up everything correctly is probably the hardest part. In addition, I had to use a line converter. I did the install without one and there was hissing and al sorts of distortion. Once I wired it in, sounds perfect!
Currently, my HU does not sit flush like the CD400 pics that I have seen in the How-to Thread. I am not sure if I missed something or not, I am waiting on a response. Though it does not look bad at all sticking out a bit.
Lastly, whenever you turn on the power to the HU, the HU lights go on. I was thinking it would have been the same as the OEM unit (the lights turn on when you turn on the driving lights), I am also waiting a response on those. I am not sure if the HU is supposed to behave that way or like the OEM unit.
My take on the MB-VI in general. Looks really nice in my car. Not too complicated looking, but has alot of little features compared to the OEM. Sound is excellent. I can crank it up and the music is clear. Contrary to what the manual says, my MB-VI will play burned Cd's. Also, the set up of the CD's is really cool, pretty trick stuff.
My only gripe (and it's a small one) is that the HU is noisy when switching from one CD to another. Guess I'm not too used to the sound. Also, takes a bit of time when changing from CD1 to CD6 due to the way the CD loading is set up.
In general, I think it is a nice aftermarket HU. Good quality, excellent look.