The ability of having two separate screens for managing leads or opportunities in different stages (warm/cold) was one thing I liked about this product! Other than that it's pretty much ok as far i can see from my side but maybe some more features could be added like better integration with CRM system so you dont need 2 apps if they are not integrated well together - otherwise its perfect solution when dealing cold email campaigns where lead needs nurturing before going into next stage which means opportunity management part would help alot too!! You will save time by being able have all your emails at once without searching them separately via multiple tabs etc..