I like how their UI is so intuitive even for non tech users! With one click you can access all your emails at once in an easy way without having too much technical experience or knowledge about computers/email system itself (which sometimes might confuse me). Sometimes it becomes slow while loading certain pages which takes few seconds but not really annoying since its fast than most other service providers out there. Also with this platform i get notifications whenever someone sends anything through my account making managing multiple accounts easier as well as ensuring security by knowing who has accessed what information when compared against others sending similar info. Just go ahead with them - no regrets ever made using sendicertiFied. They are best among those that support SLLs (Self Lock Locker) feature hence they provide better customer protection especially if u have sensitive data stored within ur inbox (if anyone wants proof check previous reviews of mine here https://www2.sendicitcertifiedreview201620172018201920202021.com/ ) The ability for me as an individual being able to attach documents that are larger than what I can upload via my computer is great! It's also very easy to use because it has all your security information already taken care off by someone else (I just have no experience with this software). Nothing really - but if you're looking into sending out important documents or other items then definitely look at using them. We've been able to reduce our carbon footprint greatly through their program.