The ease of use - I can search by keyword or category very quickly without having any problems! It also allows me access my photos at anytime via their app which makes life so much easier when working remotely (which we do).
There isn't anything that really annoys us about this site but they could improve upon how often pictures update if there were some sort of notification system out here somewhere? We have been using alamys services since 2012 as our primary photography supplier who supply all aspects including editorial work such as fashion shoots etc.