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sas81 said..
I think gong IT has now little different rails and a little more volume since 2014/15
Yes, the volume and details of shape of the IT have changed somewhat during its life.
Gong does not actually changes shape per year: some models are tweaked each month, some stay the same for years, and changes can happen anytime.
Gong does not keep the technical specs on the official site, as they fear it could confuse people. You can find the specs of a specific model often in the forum on the topics dedicated to the board, or just by mailing the team.