It really depends on the pricing. It is an AC1750 router. Most reviewers, like SNB mentioned above, recommend the current sweet spot as AC1900, which is a step faster than 1750. The reason why is that speed difference is on the 2.4GHz band, which is the one you'll get better range with. This is not true with the 5GHz band, the speeds would be the same. So if you sit within 10-15 feet with no obstructions from your wifi router and can use the higher band, then the Airport isn't a bad deal. If, however, you need better speeds in multiple places in your home, or you have devices that are 2.4GHz only, then you'd be better off getting one of the newer AC1900 routers.
There is another reason you might want the Airport though, and that is if you have older wireless clients. In order to get that 600Mbps versus 400Mbps speed on the 2.4GHz band, you need a client that supports AC1900.
So ... it's a wash to be honest. If you have the latest and greatest laptop wireless adapters or mobile devices, get an AC1900 router. Otherwise, if the Apple Airport is -cheaper- than one of the newer AC1900 routers, then sure, it wouldn't be a horrible deal. My guess is that their sale price may not be in that sweet spot, despite halting production.