Once the first week is over, the thing owners still notice is the weight. One owner who moved from a Logitech Superlight found the shapes felt similar in the hand but the drop in grams was obvious every session. The clicks are the other lasting pleasure: the ability to set feedback and actuation per button is the reason more than one owner made it their main mouse, even without any measurable speed gain. Weight balance, which some found back heavy or prone to rolling on the original version, is described as reworked and much better on the newer revisions.
What people adjust to is the click behaviour itself. Very light actuation means the resting pressure some players use on other mice will register as a click here, and one owner was still adapting after two long days. Shape comfort is divided: some find the rear hump supports the palm nicely, while others are still working out where their fingers should sit, and one owner rotates between many mice without settling. Owners already happy with the X2 are told the next model brings small changes rather than a new experience, and several question whether the upgrade is worth the cost.