I only have a K3. I own a Sony PRS-350 but it's really for my son to use.
I would consider a lighted reader at some point to keep by the bedside, and keep my K3 for travel and outdoor use, but I have not found a lighted reader that compels me yet.
Harry is correct that no major reader ties you exclusively to any one retailer, but many of them them do provide a highly optimized umbilical to one.
In any case, like many here, I can obtain ebooks from any sources I've ever cared to obtain from, in any format I care to use, with equal ease, so that's not a factor.
ApK
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