The Grooved Board Burr series was an amazing innovation in the design of board burrs where instead of just burr plates that the solver has to figure out how to take apart, they now have to deal with blocking pins obstructing their ability to dismantle this burr. I only ever had the luck to try #6 and #7 in the series, but they were both an absolute blast to solve!
It's the hardest one in the series and stays stable for an impressively long time. But the final few moves before the first piece can finally be removed are somewhat unstable. At that point, it's possible to cheat part of the solve by rotating a piece free, but why cheat yourself out of a fun puzzle solve? It's also somewhat "spiky" with far more visible pins than any of its predecessors which made for a slightly quirky solve compared to #6 in my eyes.
I think any burr fan will love this for the high quality in its construction, the unusual nature of a grooved board burr, and getting a burr that gives a nice level of difficulty without going too far and being more difficult than fun to play with.
Here is the website page for the original puzzle's description: https://shop.pluredro.com/products/grooved-6-board-burr-7
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