I wish they’d include a proper preview with their ebooks, so I didn’t have to go to amazon and check their previews all the time. They seem to just automatically include the first 3 or so pages, without any thought to whether those are useful. Plus they don’t include the table of contents.
Based on looking at amazon prices alone, it’s a pretty good deal - most of the first tier are priced at about $40 each for the ebook
(or you can rent them… is that a new thing on kindle?)
That said, the problem with programming ebook bundles is it’s very unlikely you’ll want more than 1-2 of the languages, and that they go out of date quick.
I mostly just wanted to rant about the rubbish previews.