Doesn’t fit regular bottle; require special base
Disappointed I didn’t realize this wouldn’t fit the regular 4.2 ounce bottle of Dramatically Different lotion or hydrating jelly base. Bottom of the cartridge is the same size as the opening on those bottles. I contacted Clinique and they explained that I needed  the special ID base. That bottle has 3.9 ounces  to allow room for the cartridge to fit in. I haven’t had the cartridge  long enough to judge it, but gave 4 stars for Clinique’s immediate help.
Rating: 4 stars