That is the the exact unit I am running on my 340 gallon sps dominated mix display tank and the calcium reactor kept up until 8 month mark at which point I started supplementing kalk, and now at 10 month mark, I am supplementing 2 parts, so I would say you may be ok for a year or so, but once your corals are established and started to grow fast that calcium reactor will not be able to keep up.
It barely kept up with my fully stocked 135 gallon sps dominated tank towards the end of 4 years, but my corals were growing out of the water at that point in time.