I got about 30# of these in a significant craigslist score and finally got around to fooling with them.

If I predrill wrong, these are a great way to wreck a project. When I predrill correctly, I have done about 20 test joints now, these suckers can make a stout joint. Stronger than is needed to build a stick framed house, hard to demolish.

I have no problem with round nails in stick framed construction, they work for that and I understand the need for speed. But these square and rectangular tapered little rascals are much closer to wood screws in holding power than they are close related to round/ wire nails. When done correctly these are a bugger to take back apart.

I am impressed with them. What have you found?