The ability of this program is amazing! It's quick response time as well has all my different programs that I use each day when it comes down ti synchronization/backup issues between them are solved within minutes rather than hours like some other software does (such as Dropbox). Well there really isn't anything bad about how their product works out but if you have one or more backup solution then its ok because cirsync will fill in any gaps from those type backups with ease! If your looking into backing up files online through Google Drive etc.. go ahead & add in "Cirasyn" along side google drive so they can work together very efficiently at no extra cost :D I like that it syncs with my outlook 365 calendar very well and is accessible on my phone. It also syncs with our CRM. I wish it would sync with more CRMs. It is a little bit pricy, but that isn't the biggest problem. It is a great product that is easy to use. It makes our life easier by syncing with our outlook 365 calendar, our CRM and our phones.