They are cheaper than SPAX but not inferior to their quality. The square head is flat and rounded on the bottom and my bits tend to slip out and I cut into material with my bit - maybe it's just my application error but I don't have that problem with any SPAX screw. However when the bit grabs it fits well but it was 50/50 and hurt my thumb when my bit slipped off while riding. One broke in a 2x4 Douglas fir, maybe it hit a branch, maybe I drove too hard. ; one was completely warped out of the box and many of them were uneven (not a big deal, but then again those screws feel "soft" on them). TL; DR: These are great cheap screws for decking etc if you need hundreds of screws in one place. I think I can continue to buy them for the price alone, but I don't think they match or surpass SPAX in quality or handling.
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