I like that it's easy for my clients as well, because they can easily upload their images from anywhere via email or phone call! It also has an option of creating custom templates which are very useful when you're sending out large numbers of quotes/invoices at once time with different information in them (like date range).
The only thing i dislike about this program so far was how slow some features were loading up sometimes - but we've since updated our internet speed & now everything loads super fast!! So all good things :) As mentioned above- having multiple people involved within your team who need access will make life easier if using something such as alphaia.- uploading files directly into emails / text messages etc makes communication between members much more efficient than manually copying each other over documents everytime there needs changing info added onto one document.