I have legally bought a generous amount of O'Reilly ebooks. I read mostly on my kindle and the mobi files where always quite good. also, no DRM at all. Also, being a regular customer gave you a 50% discount or someething, so the price was quite reasonable. And saved you a whole evening fishing for a 'free alternative' of exactly the book i wanted, in mobi/epub format. If it existed at all. The money/time/effort/content quality tradeoff was quite good, in my case. Now, O'Reilly is mostly an endless flow of the latest of the latest of the newest and up and coming fad and rehash tech of the week. Not much interesting to me anymore. I don't really need 'buying' a book (at most) of that every month, month after month. I think the authors of good books really deserve my money. O'Reilly now? not so sure.