Great things. They're easier to solder than you might expect. I've found that they allow the post connector pins to be soldered to them, making it easy to form a breadboard or chain together with the socket's wires. After a lot of reading and experimenting with the Raspberry Pi3 I found that they are very easy to use in a small chain with Python. More than one chain and big strings require a lot more work. Now we are ready to play at a higher level. A great use for this form factor could be to sacrifice the first pixel and a boost repeater/buffer from a 3.3v Pi. Very happy with this purchase.
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