I have not tried them as I am not into aftershave splashes. These are not cologne strength and certainly not EDT or EDP strength.
1. They are based on witch hazel, rosewater, and glycerin.
2. They contain a blend of essential oils and fragrance oils. Some essential oils are inexpensive, some are quite expensive. Fragrance oils tend to be less expensive.
3, Some of the fragrances are "dupes" of more famous colognes and EDPs. When made with fragrance oils, some of these dupes can be inexpensive. The original scent is often analyzed using gas chromatography and then a reasonably similar substitute is produced from lower cost ingredients. While the dupe might smell similar to the original, do not expect the fragrances to have similar silage or longevity.
Some people can afford to pay several hundred dollars for a brand name EDP, others are satisfied with a lower priced substitute.