I bought a pair of these. Great blocks, good performance, flexible mounting, was able to mount one to a delidded 7950X with some basic hardware store bolts. My only complaint is that the base is *wildly* unflat. There's a pretty aggressive high spot dead center, where the fins are on the inside, which is fine for near-stock mounting, but if you delid/lap, the block won't give good contact. I'm lapping one now to get a properly flat mounting surface, and am having to remove a *ton* of material just to get a baseline flatness.