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It's decent enough that I will be combining what's new in "Into the Borderlands", with the new stuff in "Return to the KotB" and an 1E version of B2, plus some other 3rd party module enhancements.
You can use some of what's here for sure, but the baseline content is full of problems.
SPOILERS!!
NPCs size up the party in a cutesy way and then attack without any hope of success. Single kobold guards attack the party without attempting to group up with their tribemates. No attempt is made to create a coherent framework for caves of chaos (you can do this of course, but you could do it with the original too). No one has noticed the xvart tribe despite them lairing feet away. A trap that presents as a puzzle but is entirely random just to dick with the party. Glaring inconsistencies in tone and detail abound. Some things are explained ad nauseum, while elsewhere a gelatinous cube just wanders into a room without anywhere for it to have come from.
I agree tower picture doesn't fit with the theme of Quasqueton to me, but that's easily fixed by not showing it. The bramblemaze is more of a tell to me in that it's both overly gamey and doesn't serve much of a useful purpose, (on top of it being kind of ludicrous to die to ordinary brambles). Swapping it out with a cooler tower overall seems a good move.
Sure, you can take what's here and make it work for you, but you could also take random short adventures from your library and shove them in too. You'd probably end up with something more original & interesting.
It's not all bad, but mostly what you're getting is the 5e rules conversion. If that's worth the 50$ to you, then by all means enjoy it. I do love me vaguely sandboxy structure, and that's there for sure.