SyncThemCalendars for syncing electronic calendars?

Hi,

I've had three calendars conflicting with each other for about two months now... Google Calendar for work, the Apple Calendar on my iPhone, and an Outlook Pro account that my company set up not too long ago. So I was looking for a tool to centralize all of that, and I came across SyncThemCalendars while searching for a calendar synchronization solution. The concept looks pretty good on paper you connect your different sources, and it syncs events across all platforms in real time. Except I haven?t found much concrete feedback on it the reviews on forums are either outdated or downright useless. Personally, I?m worried about duplicate entries; it?s happened to me before with another tool, and it was a total mess for a whole week. Has anyone used this in a multi-platform setting? Does it really hold up, or is it something to avoid?