Long female header pins?

I've just been sent some samples from samtec (very quick!):

SSQ-108-23-F-S
SSQ-106-23-F-S

They're 6 and 8 - way long-tailed 0.1" pitch sockets.
The 'F' is for "gold flash selective" (gold flash inside the sockets) but with Matte tin on the tails.
I went for the 'low insertion force' (the '23' in the part) and it seems just right.
I'm assuming that matte tin is OK to use as a connecting pin.

Here's a picture: