I wanted the 4:3 screen format because it best fits most of my pictures, and has more screen size per base footprint than widescreen.
I've had the frame for a week now, and it continues to work perfectly. I tend to use a USB stick with pictures, music and videos on it, with the device in the calendar mode with the large image, playing music in the background.
I've used the remote for everything - much easier than trying to do it all while reaching for buttons on the back! They provided a lithium battery for the remote.
For now, I've got the device set to turn off at 6pm each day, and turn on at 8am. One minor nit: when it comes on, it goes into picture slideshow mode instead of into the mode it was in when it turned off. A button push on the remote is needed to put it back into clock/calendar mode.
Picture quality seems good to me. Sound is what you would expect from small speakers. Only problem with video was when playing from SD card - sound was bad. Seems fine from USB stick, however. Could be data rate problem from SD - thumbnails are noticeably slower from SD.