The best feature is that you can do everything online without having physical copies of your forms or files in place! I have used this for about 9 months now with no issues at all - it's seamless as compared when using other software which require hardcopies/physical file storage etc (eg Evernote).
It really helps keep my office organized because we are able to store our information right where ever i am- via mobile devices rather than relying solely upon emailing attachments back & forth between us both if something was misplaced by mistake e.g.