VMware vSphere 6.5 it’s quite popolar now, considering the deadline for the version 5.5 in this year and the direct upgrade path from v5.5 to v6.5. But maybe not everybody want to update vSphere 6.5 to Update 2, considering that there will be no upgrade path (yet) to version 6.7 and maybe other minor issues due to the backport of some features.