Intial Expercience
I just got the WRT1900AC, though it came much later than expected, so I am not able to fully test and use it in place of my Asus AC56U at the moment.
My Initial Experience: (just a quick setup)
Very nicely packaged. Very high end packing and padding.
This router is quite chunky and heavier than any consumer routers I have worked with. Feels very much like a solid device.(though the weight may just be from the metal heat-sinks I surmise).
I like how it has wall mount support, though it would have been nice to include a template so I can mount it easy and straight. When I move the antennas up flat, looks like a giant lady bug or something on the wall. People will notice it.
It uses a power brick like a small laptop cord. Its a 12v 4amp cord. Strongest one I have yet to see on consumer routers(most are 12v 2.5amp).
I read somewhere that the included cable was Cat6, but the box does not say Cat6 (just "Ethernet cable"). The cable it self has no writing on it to identify it. It also is flat, which means it is not a twisted pair cable. I don't recommend using it for main use.
I hooked the WRT up briefly. Just connected the WAN port to an open port on my switch which is connected to my Asus router, then connected port 1 of the WRT to my laptop. First browser window I opened, got the Linksys setup wizard, which I chose to skip. I saw a notice to update firmware and it updated very quickly.
I have to agree with Cnet? in the organization of the SmartWiFi UI Linskys has. It is certainly more refined from what I used back when I had an EA2700. But I had to hunt around for some settings. Some settings are in the wrong category. I still don't really like their UI that much anyway.
As many have said, this router is lacking in features compared to others. (I am spoiled by my Asus.) 3 biggest features are DDNS services are limited with no included free service. No built in VPN server/client. (supposed to be coming..sometime.) WOL page as well. For a top-of-the-line device, I would expect these features (at a minimum) plus much more advanced settings, especially since this is priced a tad higher than other top models.
As far as wifi goes, range on both 2.4 and 5 appear to be a tiny bit better.(just by using WiFi Analyzer app on my S3). Actually, the 2.4 band seems to be quite strong...strongest 2.4 router I have used as of yet. However, I don't use the 2.4 band due to a very cluttered environment.
Quick test of the 5g wifi,(I am about 5-10 feet away) laptop connected at the full 866 link rate and file transfer speeds were a tad slower than through my Asus directly, but this is hooked up after it, so its not the best comparison at this point. Just wanted to make sure things were working.
I hope to further put this router to the test at some point.
More testing: HERE
http://forums.smallnetbuilder.com/showpost.php?p=118450&postcount=201
I am definitely interested in OpenWRT, once they put out a good official release and they get the Marvel driver re-done and things all worked out.
Overall, so far, impressed with the hardware, but not impressed with the firmware. Linksys should have put more effort into their firmware for their flagship product before releasing it. As it stands, I do not think it is worth the current price.
UPDATE: I just tested the USB storage ability of this router. This is wired over gigabit Ethernet. Win8.1 Drives formatted in NTFS. File is a 1.10GB .mkv video file.
USB 3.0 2.5in 320gb 7200rpm (seagate)
To router: 70-76MB's
From router: 70-83MB's
eSata: WD Blue 3.5in 500gb 7200rpm
To router: 70-76MB's
From router: 90-95MB's
Fastest speeds I have seen for a router.
I also noticed that when I enabled the network share, it showed the "System Volume Information" folder on the hdd, which I deleted without issue. I also saw other shares besides the 2 hdds I had connected...on the network from Win Explorer "sda", "sdb" but both of those did not have any space...not sure what those folders are.
Also, I changed the name of the router from the default "Linksys**" whatever it was to something custom, but it doesn't seem to have actually changed it. It still showed the default router name on network shares.
I also note that adding port forwards are not as nice as with the Asus. I can just copy and paste my list of ports (e.x: 80,443,8888,..etc) in one line and the Asus page and it works great. This Linksys, only supports 1 port at a time per entry and I kept getting a pop up of "Invalid IP". Also noticed, the PPPoE setting, it has Connect On Demand and a Keep Alive mode (redial every 30secs). Never seen that before.