I've never even heard of the Collins Dictionary
It's an English dictionary.
It's not too bad. It's cheaper than buying an Oxford English Dictionary and it's often made in smaller sizes for varying things.
If the Oxford English Dictionary were the upper class man's dictionary, then Collins is the working class's.
I've had them for school and things.
They do pocket-sized dictionaries in English and dictionaries from English to other languages. (As many dictionaries do).