The Mother Goddess, whom we call ambaal, has many forms like MeenAkshI, durgA, Bhuvaneshvari, ShAradAmbikA etc. Each of these has its own YantraM. But it is very common that even the worshippers of these forms do only the Shri Chakra pUjA, rather than the pUjA of the particular mUrti (form). This is so not only in houses, but in temples also.
Famous durgA temples have only Shri Chakra installed therein. Sringeri has ShAradAmbAl as the main mUrti; however the Yantra pUjA is for ShrI Chakram. All this goes to show the importance of the Shri Chakram.