I bought this item as I'd been specifically looking for a photo frame that used batteries/was rechargeable. There seems to be very few on the market, so when I found this one at such a reasonable price I thought it was worth the go.
The result however is not that inspiring. The picture quality is very disappointing even for the size (which is actually only 61/4" not 7") - the resolution is far too low for the size such that all pictures appear very pixellated. The menu navigation is not intuitive and the selection buttons on the top of the frame don't help. Also, the frame doesn't automatically start a slideshow when switched on - you have to select the storage media (SD card or USB stick) and then select the folder or files. There is also no transition selection - just the default (which quite annoyingly involves going from the previous photo to a blank screen and then wiping down the next photo).
On the positive side, it is battery powered, so very portable. It looks, well, funky. My daughter likes the interchangeable frames, but I think that reflects the limit to their appeal.
Overall, the frame is quite a let-down. The benefits, portability & price, are in now way outweighed by the disappointing picture quality & poor usability. The frame is now destined for my 7-yr old daughter's bedroom where it will be more at home.
I have since bought the 8" version (only actually 71/4") which is nearly double the resolution and a significant improvement and worth the money if you need portable (although the manufacturers clearly know this as it is significantly more expensive).