Basic question - are we getting ripped off?

Hi,

I'm not terribly experienced when it comes to networking so some insight would be appreciated.

We've got Fibre400 (a 400Mbps line) into our office and our IT provider is suggesting we move to Ubiquiti Unifi ACPRO (up to 1300Mbps and low rate of 450Mbps). Our old access point was rated to (450mbps speeds with an average of 200mbps)

My question is – given our line has a theoretical cap of 400Mbps, the new AP won't give us too much upside (if any)? Or am I missing something?