I waited for 3 or 4 months to leave a review. Just because sometimes your first subscription box of any kind can be awesome, but then the ones following can be... less awesome. Or your first box is a disaster and the following ones are amazing. So, just to be diplomatic, I waited.
Every month, all four of the books selected for me have been spot on. These are books I would have picked up myself in the store. I really like how these guys read your preferred genres and notes to ensure they're sending you quality books that catch you interest.
Also, speaking of quality -- I was a little nervous at first that the books coming in would be grossly used-- like coffee stains, bent pages and scribbled all over the inside used -- but that has not been the case. All of the books are in very good shape. If you're a book lover, I would definitely recommend this box.