The book was very easy to read, and I kept finding myself wanting to pick it up and finish it, but I can't exactly say I enjoyed it. It was a bit... meh. 
It's interesting to have the 2 parallel stories play out side by side, where Hannah is coming to the same conclusions in both universes is well written (same conclusion but slight difference in explaination), but the approach to some topics really annoyed me. There were some parts that felt fat shamey (would you still love me if I gained 400lbs?) and

her finding out she's pregnant and an abortion not being a thought until several chapters later

didn't make sense to me with Hannah questioning where she is in life. 
It was very readable, but some parts definitely gave me the ick and tarnished the rest of the book.