Very Disappointed
When you pay this much for a pioneer product you expect it to work, and judging by all the 5 star reviews on amazon many people are more than satisfied with the unit they received. Thus, when the 4200 is operational it is most likely one of the best in dash units on the market. Take it for what its worth, but mine worked for approximately 3 days before the system completely failed; the touch screen stopped working, the motorized face plate ceased to move and the screen went dead. This is the second 1 star post on amazon for this product out of 16 reviews which for pioneer is completely unacceptable. Buy this at your own risk! I got the unit installed in my vehicle drove around and thought it was great for a few days and then it just stopped working to my amazement. I have no choice but to switch it out with amazon for a new one of the same model and if there is even the slightest detail wrong with the second one I receive I will never purchase a Pioneer product again as long as I live.

Awesome Unit Great Features - Video Playback Limited
Great looking HU, very easy to use, all controls are where you expect them, had it installed in my 2005 Ford Expedition in less than 30 minutes. The ONLY reason I gave it 4 stars was because of the following three reasons:

1) It only plays back DIVX. My only reason for buying this HU was to take all of my Music Video DVDs and throw them on a USB HD. The problem is this HU does not playback MKV, MP4, or even AVI. So basically it does not recognize any of the most popular formats in use today. Instead it will only play DIVX which means I had to get the DivX Plus converter. The end result was really lousy quality music videos which are nowhere near as clear as the original DVDs.

Ironically the much more expensive AVIC model line plays back a much wider variety of formats. The H.264 codec handles compression way better than DivX and I have no idea why they chose such a non mainstream format.

2) While playing back videos there is no way to easily fast forward. It does not have an option to say jump forward 15 or 20 seconds, you can touch the slider and pick a place in the video that way, but when you are in traffic that's a little difficult.

3) The HU will only play up to a certain resolution. I'm not sure yet what it is, but I do know it will not play 720p or 1080p even when using the DivX codec. So even if my source video is HD, it has to be downsampled to play on this HU.

Overall though this is a great unit, it is also very easy to bypass the built in screen lockout so you can watch movies while you are driving, its not quite as easy as simply grounding the ebrake cable but it as simple as using a relay. A quick Google Search will show you how, there's even a YouTube video on it.

Also, if you are planning on using a USB hard drive it has to be formatted as FAT32, or else the HU will not be able to read the hard drive. I used guiformat.exe to format it in Windows 7 since Windows 7 would only format the 1TB drive I bought as exFAT.

fuzzy album art
I have to give this a 3.

It would have been a 5, if the album art off my iphone isn't fuzzy, blurry or pixelated. That's not what's being shown in the product description.

What gives??

A pretty nice head unit
I have had this head unit for about a month and here are my reviews.

FM/AM Tuner

It works good, pulls in the stations real good. With the optional HD radio tuner box, u can add HD (Digital Radio) capabilities which sounds incredible, very crisp and no static. Only bad thing is on the presets, when you store a station on a preset, it doesn't display the station frequency or name on it, jus says PRESET 1

Ipod

The ipod feature works incredible with this unit. Very easy to navigate thru your music collection thru it. You do have to purchase the optional Pioneer Ipod cable to watch videos off your iPod. A neat thing if you have an iphone/ipod touch is that you can watch youtube videos on the radio while you are in ipod source mode. I didn't like that the title of the songs or artist can get easily chopped off if its too long. You would think that they would provide a feature to scroll the text if it didn't fit.

SD card

This is a nice feature. I have a 32GB SDHC with thousands of songs in there and it reads it no problem. Very easy to navigate thru the content as well. Movies and music videos can also be watched via the SDHD card.

XM radio

I have the optional XM tuner and it works really good. Very easy to navigate through the XM channels. I didn't like that it chops off the title of the songs or artist when there's a bit of characters on it.

Bluetooth Cellphone

I have the optional CD-BTB200 unit connected to this unit. First off, this module is like 3+ years old so it does not use the same Bluetooth Profiles that most modern phones use. The hands free cellphone use on this radio is very basic and limited, which is not what I would expect for a 2010 model. It only allows you to answer/hang up calls and that's about it. Why didn't they allow to transfer over and your contacts or even have a keypad to dial out on the radio, it just puzzles me. It is kind of ridiculous that the bluetooth module has the capabilities to store phone contacts but this unit does not have this feature.

Best Head Unit in the Market
Spent months researching for the right head unit for my car. Bought the Alpine IXA-404... what a mistake. Alpine has a good rep on its expensive units, this one was horrible, bad sound, not user friendly at all. NOW the Pioneer 4200 DVD is a great unit, it enhances the Radio & iPod sound... great processor. Artwork looks great... LOVE the EQ... DVD looks great as well. FYI this unit starts up immediately, unlike the old NAV units. Ordered the Bluetooth and I am sure it will work great.