concrete floor leveling

[maxwardle]

i am looking to level a concrete floor in my kitchen that goes down to 50mm deep in some areas i am looking to use either concrete screed or one of these deep leveling products that apparently you can walkon in a matter of hours and work on in a day , such as wickes deep base or cempolay deep , has anyone used either of these products or ones like them . do the live up to there claims , any advise greatly appreciated .