They are definitely not all the same, as THAT ONE SUCKS!!!
Have you read this? hmm...just fried the "egg" for my lilliput
If possible (its not for me cause i have a mac mini) you can run the monitor off of the carputers psu. Its regulated pretty well, and actually provides a little more power, so apparently the screen may be just a tad brighter that way.
Other than that.... yeah, look for a quality egg.