The best part is that it works perfectly with my Gmail account which has been very important to me because I tend not want another email service for all of our business emails, especially since we have clients using several other services like Salesforce as well too! Also having one place where everything goes makes managing things much easier than going back & forth between 3-4 different accounts (my personal eMail address plus 2 client addresses + Google).
There isn't anything about this app right now but if they added in more advanced searching features you would be giving them your feedback faster. Keep up good work though guys!! We are able streamline so many aspects from contacting new prospects through sending out invoices or estimates - even keeping track off time spent vs billable hours via timesheets etc..