Semi-Frequent Flier here, I look for the mechanicals as much as I can. Never seen that keyboard but Those deskos come up a lot.
I've noticed Delta is still using the compact Deskos (picture by Sifo) with MX Blacks in their non-hubs (like my airport, RIC) and some of their hub counters like in ATL but they seem to be going with the domes more. Flew American a few times in CLT, PHL and only saw rubber domes but use the old style Desko in RIC. and Southwest i don't think uses mechanical in a long time. which is interesting, these ticket counter keyboards have to take some serious abuse, i mean If i had to deal with some of these travelers--especially on southwest, i'd be taking out on my keyboard so much a rubber dome one would break in half. I wonder if these rubber dome ones get traded/replaced out frequently.