I bought this sketchbook and the smaller size, mainly for plein air painting and for practicing at home. The size of the book means it is easy and comfortable to hold in one hand or on your lap while painting outside or on the couch at home without feeling flimsy. The paper quality is lovely and responds really well to wet on wet with very little buckling or warping. I'm yet to try it with masking fluid however have been really happy with how it handles washi tape. I'm enjoying using both of the sizes I bought so much I bought two more recently.
My only concern with the first book I bought was that when I first opened it, the cover lifted away from the spine, exposing the binding, and is now hanging off somewhat awkwardly. I have not had this issue with the others that I've bought, so possibly that was a one off. I don't plan to gift it and it's purely for my use, so it's really not that big of a deal for me.
Another reviewer mentioned the epically sticky barcode sticker on the back cover. I had a similar experience and found that the adhesive lifted easily with a little bit of that orange-scented sticky substance remover you can buy in supermarkets and hardware stores.
All in all, these books are great and I'll most likely repurchase.