No, not really, AC1900 is mostly pointless and AC2400 isn't really relevant, yet. Why?
Well, there are no 600Mbps 802.11n clients which is why AC1900 has a higher rating over AC1750, otherwise the two are mostly the same, depending on the chipset maker.
AC2400 has the same problem, there are no clients so far, so unless you're doing bridging between two router, you won't see any real world benefit.
What will matter, once it works, are things like multi-user MIMO and beamforming, but so far its still early days and compatibility across various chipsets is poor.
It doesn't mean I'm saying these are bad products, there's just very little reason to get one based on the limitation.