I think this is a "300-300" ("N600") dual band router, yes?
And do you want identical services or one that claims to offer better speeds?
If you want 'better', then you're also going to be replacing Adapters, too, therefore.
If this is the case, then I'd ask, "Are you using the 5ghz band? Does that give you best or comparable speeds compared to your 2.4ghz band speeds?" (If so, you'll be walking into a $150+ ballpark for router and adapter. How does that sound?)
Most newer, higher-rated routers focus on that 5ghz band's thru-put. If your environment has lower speeds on 5ghz than the 2.4 band, then a new router will likely suffer at the 5ghz bandwidth, too.
If you're going to be using the 2.4ghz bandwidth and want speed improvements, your choices are few and fewer.
There are perhaps less than a dozen adapters that offer N450 speeds, and only one or two that claim N600 speeds in the 2.4ghz band - and that's a $100 Asus adapter.
However, if you're going to stay in the 300-speed 2.4ghz bands, then "everything" is open to you. You might just swap routers and see if this changes the thru-put.
(And, before I forget, there are all kinds of $20 antenna options that boast better speeds, too. We use some of the Asus ANT-157 with some benefits. It's worth $20 but not much more, in terms of price-per-speed increase.)
So, if your current 5ghz speeds are the same or better than your 2.4 band speeds, then maybe you're a good candidate for the AC1200+ routers and adapters. (And when I buy locally, I can easily return those products rather than RMA them if the improvements aren't there.)
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