Panasonic DVD-LS91 Portable DVD Player
LS91 compared to LS90
I  have a LS90. It works great. I bought LS91 as a spare. It lasted 1 day before developing a crack where the hinges are. Before I returned it, I tried all kinds of DVD with different formats. Some formats do not play on LS91, I guess that is why it's cheaper than LS90 although when you compare the specs from manufacturer, they are identical. It could be that the LS91 cuts corner on the quality of the product to make it cheaper (maybe that is why there was a crack developed after one day although the LS91 I got could be a lemon to start with).