I've definitely had good experiences with Diesel so far. I've only bought 4 books from them, but they do have a gigantic selection. While I personally detest ADE, it's a necessary evil due to the restrictions the agencies put on ebooks, so I put up with it =)
I can say that I've had far fewer issues with Diesel than with Ficitonwise and other sites I've used over the 8 years I've been using various ereaders.
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