these are the ones I have. They are stackable/modular. The price went up since I bought mine about 5 years ago, but I did just buy a "scratch and dent" one and saved a bunch of money. There was nothing I could see wrong with it.
Forgive the mess--I'm reorganizing my office at the moment and moving stuff around...
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The shelves come without any inlays. I'd recommend the inlays on the bottom for every shelf to create a flat shelf all the way across. These are inserted while building the shelves so they are locked in. See here--darker wood is the inlay:
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Then for only the top shelves in each stack, I got the inlays for the top. These just pop in and out--they are not attached in. But without them, the shelf is open on top. Adding the inlay allows you to put stuff on top of the shelves.
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Hopefully this all makes sense hah.
The LP module ones are different size/design I believe so the inlays are not interchangeable with the artisans. I got the Artisans because it allows me to add more later or change the configuration. I previously had these stacked 4 high and then 3 high next to it, and then moved them to a wider wall and stacked them less.
Also worth noting--I don't think these fit box sets if that's a deal breaker.