1). Unlike some reviewers here, I have had NO PROBLEMS playing double sided DVDs. People should verify their claims before they whine generally about something that may be a specific problem with their unit. 2). The unit is very small and doesn't seem to get nearly as hot as the L-50. 3). My only concern is that the manual warns against using a car power source (cigarette lighter) for powering the unit. I don't know if Panasonic will come out with a car adaptor kit or not, but until then, I'll just have to use the battery.
1) The picture quality. I have to admit I traded in the Panasonic L50 for the LV75 because of the larger screen, no doubt about that. While the LV75 has the bigger screen, it loses the sharpness of what the L50 had. There's a slight pixelation per frame when solid colors of objects are displayed (like a wall or the sky).
2) Dual sided DVDs cannont be played. When a DVD offer a widescreen version on one side and fullscreen version on the other, the LV75 will not recognize the format and will not play (movies like Dogma, Austin Powers, 8mm, etc.). This is my major gripe because I cannot play some movies on the LV75.