I love that it's easy to use, very intuitive with its drag & drop functionality; however this makes is hard not be able too much customization in advanced settings! There are some things you can't customize like email notifications etc., but what they've done so far has been great already - especially being an agency we have tons of projects at once which means lots more workflows/worklist items than before using trunk (or any other tool). And all our designers just LOVE how simple everything works together as one big team instead having multiple tools or services each doing their own thing now :).