A smell-a-like is a perfume that smells like a designer fragrance but with a different name and packaging, and at a cheaper price. A smell-a-like isn't an exact copy, but often smells very similar.
If you wear Eternity by CK you will love this fragrance. It has great longevity and projection. Have no doubt about this. Five stars.
Used Eternity for years, nowhere near. Unpleasant "medical" small
I've used Eternity for years. This is nowhere near. Had a vaguely antiseptic smell