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Just to add to [USER=2672]@Jessica Booker[/USER]'s response, I think mentioning Chambers/Legal 500 rankings can be very useful for your reasoning around the firm's unique selling points in terms of practice areas strength and sector expertise. It is a way of evidencing your claims and placing the firm in the context if the market competition. However, as Jessica mentioned, it is essential to connect the point your are evidencing with the ranking with your motivations, interests and experiences - ie. why are you interested in working at a firm that has excellent renown for X practice area/sectors, and which of your work/other experiences reinforce this point?