I like that you can have multiple accounts, so having my work account separate from personal emails makes things easier for me when dealing w/ both sides at once! The only thing i dislike about this product currently would be if there were more filters available (ie.- just search).
It's not bad by any means but could use some improvement in terms or filtering features - maybe even add something similar as Gmail has? Just one suggestion though; make sure your app integrates well into other apps suchas gmail clients because they are very popular now days among many people who rely heavily upon their services & programs while working online during day time hours etc.. Having 2 different mail addresses allows us flexibility since we're able switch between them depending what needs meted out within our business environment which includes being flexible enought o handle situations where someone mess.