The Hobonichi Weeks, and by extension the Weeks covers, are very awkwardly-sized. Good luck finding a thin-paper notebook in those dimensions, not to mention one you can slip into your Weeks cover in addition to your planner! Especially if you're looking to buy locally and avoid ridiculous import charges from the US, there are extremely few products on offer in the european market. As such, GoodInkPressions was a wonderful find! Even the thicker notebook (160pg.) fits in my Tragen cover, right alongside my Weeks. Much appreciate the dot grid paper, as well.
There are some drawbacks, albeit minor. One is the long time until delivery (about a month). This is perfectly understandable for a small company. You just need order your notebooks 4-6 weeks before you actually need them.
Another (mostly technical) issue is the way the notebook fits in a cover: due to the thinness of the paper, you absolutely _must_ use a pencil board, otherwise the pockets/features of the cover will damage the paper once you start writing (alternatively, you can remove the notebook from the cover every time you want to write something down). This is only for the outer 10 or so sheets of paper. After that, things become manageable.
One last point I'd like to make is that you probably don't want to use a (160pg.) GIP notebook in a Weeks cover by itself (e.g. as a BuJo). It's slightly thinner than the Weeks and looks very sad on its own. So, if you'd like to use a notebook this size in a Hobonichi cover, but without the Weeks, consider doubling up to make it a tad heftier.

love it! just as expected.great quality, shipping was fast, love the colors I got (fuchsia, purple)and I'll sure get more. great for my fountain pen ink swatches

The price is right, the writing pleasure as expected. Just missing the smell that new notebooks had in my young years, but it may be that with the, I do smell less

I really appreciate the seller taking the time to perfectly execute my requests. The fact that I can basically have a custom made notebook is incredible.The details are just wonderful: from the paper quality, to the textured covers, and the sweet little book dart. Excellent craftsmanship and definitely worth the wait.

I love the quality of the paper and the fact that it's thin but not enough to let the fountain pen inks bleed through. And also, it has a lot of pages, that's really convenient so the refill lasts longer than the original ones.