I love how easy it is when you get used with this tool, that's why i don't have any dislikes about graph cool! It has helped me solve my problems in terms of data access/manipulation as well business logic without having much hassle or coding at all because everything are made available through their API which makes life easier than ever before!! Nothing really but if your looking into solving some issues regarding database management then definitely try out these guys they will help u more soo easily compared from other tools like Dataloader etc..