Another (strong) vote for Z-Sense.
The shim works but sooner or later you will wish for the simplicity and consistency of Z-Sense. And once you work worth it for awhile, you'll realize how useful it is to have easy, complete control of the nozzle-to-bed gap - smaller for better print adhesion but more difficult removal, larger for less "stick" but prints that pop off easily. Z-Sense also makes using alternate beds and bed surfaces such as BuildTak, PEI/Ultem, etc. a quick, easy re-cal.
PS - I'm a fan, not an investor. And I violated no federal, state or local legal or ethical rules in the posting of this endorsement.
