Blake Crouch writes a good story. Don't trust anyone who says otherwise.
Recursion. It begins with a bang and does not let up until you set the book down and open GIMP to make the image for your review. This story did not change me in any fundamental way, but it did exactly what it intended to do as a science fiction thriller - it kept me enthralled, ripping through pages and devouring it in a single weekend.
Barry and Helena are good characters. Their story arcs are tight and their love is endearing. I could have done with one or two fewer timeline jumps in the final act; they began to feel slightly tedious and I remain unconvinced that five failed attempts is better than say, three. Regardless of this criticism, it was a very solid story. Crouch did his homework when it comes to the neuroscience of memory which allowed me to suspend my disbelief with regards to the objectively unbelievable technology that is "the chair".
The concept of the dead timelines and the memory anniversaries was something I have not seen before and added a cool new twist on the time travel genre, something that is genuinely difficult to do with how well-tread that ground is.
Overall, I would recommend this book to anyone who wants a quick exciting snack that they can wolf down in between more substantial meals.