I have both the sony lighted cover and the mighty bright flex 2.
I have always used mighty brights for my ereaders as they are so good. Batteries last months in mine, but they are bulky and add weight to the reader. Very bright, very reliable. They do take 3 batteries though, but they do last months.
I had the lightwedge cover for my sony 505 and hated it, I have never used it, so was dubious about buying the lighted cover for my 600. I just got one recently and absolutely love it. The light is more gentle than the mighty brights, but I have found I actually prefer it and in darkness the light is just perfect. It does not glare but gives a very natural light to screen, as though it is in daylight, my mighty bright just glares, I prefer the sony light myself. The cover is really lovely quality too, far nicer than my 505 one was. The light mechanism is very neat and does not add much bulk to the reader, in fact I like to hold the reader where the light housing is. The cover also bends back on itself very easily. I have used mine daily for a month now and no sign of the light dimming yet, so the single battery works well. I prefer to have the light at the left edge of the screen, rather than the top, it gives a very even light this way.
Depends what you want really, mighty brights are fab and you can use them on anything, they are very bright but bulky.
The sony lighted cover is very neat, has a natural light and you will always have a light handy.
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