Be Warned; this entire mini-series is also in The Tithe Vol 3, and there's nothing additional in this collection that justifies its separate purchase/reading. Throwing in Issue 1 of the three intertwining series kind of makes sense, in case the reader is only familiar with one or two of them, but at the same time it's also a waste of space for its target audience who has read all three series.
The actual mini-series is also underwhelming. Think Tank hardly factors in to the story, as it focuses more on The Tithe's secondary characters ending up in Eden. And while Eden is the setting for most of the story, nothing in the story really feels like it has any ramifications for the town, even though some of its actions have a major effect on The Tithe. It's a decent enough story, but the conclusion feels unexpectedly brief and underwhelming, and the major event almost comes across as cheap. It doesn't really enhance any of its component pieces, but still feels like a required read, even so.