[Android Q&A, Help & Troubleshooting] swiss420:
Fun Gadget with promising Features and a few downfalls.

I got one of these Acer DA220HQL Smart Displays a couple of days ago. I figured I will share my experience so far.

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Hardware:

The Screen is well viewable from different angles and it stands solid no matter at what tilt you set it to. You do have to use two hands to tilt it up or downward. The one Button it has is solid. USB Ports are on the right side. HDMI/Micro SD/Power/Ethernet in the back. No VGA or DVI Ports. Mini USB for Touchscreen Support under Windows and Audio Jack are located on the left side. Along the bottom are the Speakers which are loud enough but not spectacular. The swirly silver Cover over the Speakers is in my opinion not exactly beautiful and would have been nicer in black. But that is just an unimportant detail which might not even bother you. There are two holes behind the cover above the Power Button not sure for what that is.

Android:

The Display is running with the newest Update Android 4.0.4 Kernel-Version: 3.0.21-00003-OMAP-Android+ UI2xECx2@devel#1 SMP PREEMPT Thu Mar 21 15:41:01 CST 2013

Pros: Runs smooth with great Touch Support under Android. Acer delivers a Quick Access Soft button add-on to Access Volume / Settings / Favorites etc. fully customizable. Logged in with my Accounts and was able to install all Tablet Versions of my Apps. I choose Apex Launcher Pro as my Default Launcher and restored successfully my Backup from my Paranoid Galaxy Note all Apex Settings. Android continues to run in the Background. Meaning you can start a download and Switch over to Windows 8 until it is done. With the Display connected via USB to Windows you get Access to the Storage Spaces of the Display to copy things to and from the Display.

Cons: Speakers do not continue to play when switching to Windows/HDMI. Switching between Android and Windows could be faster.

Windows 8:

When connecting the Display via HDMI and USB for Touch Support you get a two Finger Touch Display for Windows. You can Switch between Android and Windows 8 by staying on the On/Off Button for a while until the Onscreen Display (OSD) appears. Under Android you get an Icon to Switch faster.

Pros: Solid Stand for Touch Operation, 1920x1200 Resolution, One and Two Finger Touch support works good in Windows 8 for Primary Display.

Cons: Only two finger Touch Support which means in some apps limited Multitouch Support (Bing Maps 3D etc.), For Gaming I recommend a Gamepad like the idroid:con - Bluetooth Android controller since the two finger Touchdisplay does not react if more than two fingers touch the display. Works in combination with a Multidisplay System (I am currently using 6 Displays inkl. the SmartDisplay) but the Acer DA220HQL can only be used as the Primary Display with Touch Support. Without Touch support or in Mirror mode it will work fine.

Would I recommend this display?

Yes and No. Yes because it is a cool gadget from Acer and is a cheap way to have a Touchscreen for your Computer with added bonus. No because Acers gadget are not always fully up to par (instead of two finger it should have 10 finger support). In the long run that will become a Problem. I owned over the years a couple of those oddities like an Acer C300 Tablet / Acer Iconia DualTouch Screen / and now this Acer Smart Display. They all had their share of problems and I assume over time this will not be different.

Would I buy another?

Yes, for my Grandma since it is perfect for a Skype Station with the Built in Camera. I would love to use Paranoid Android on this Display to adjust DPI Settings and switch to Phone mode but for my Grandma it would work out nicely as it is.

PS: It seems the Viewsonic 220VSD 21.5" Smart Display and the Acer DA220HQL 21.5" Smart Display is the same Hardware just a little different Software.