This is the fourth day with this router and I understand the requirement of people who visit the review for the same. The ultimate need is an All in one device, so let me get straight to the juice of the product. First, Its an ADSL 2+ Modem Router, avaialble in both Annexes (A/B) depending on the country of sale and Annexe A is for India. Second its a/b/g/n certified [i.e N 300 (2.4 GHz) + N 450 (5GHz) some also state this is an A specification] concurrent / simultaneous dual band router, i.e devices which support only N band can benefit only from the 2.4 GHz band, ex : Mobile phones are usually N certified for 2.4 GHz, with a few for abgn in total, check your user manual for the support. The WiFi Range and signal strength is pretty good even with walls in between. Can easily support 10+ devices at various points in house. Additionally I liked the Mixed mode of security i.e WPA/WPA2 devices can work with the same router security key to get hooked to the WAN. Third its a DLNA certified media hub, i.e all the connected devices (on LAN Port + 2.4 GHz WAN + 5 GHz WAN) can interact flawlessly over the dlna connection, Fourth is the inclusion of USB port, although I wished two ports, a multiport hub can fit here and then devices can be connected. I have not tried a 3G/4G dongle for this so I will reserve my comments on the same here. You can add a printer to this USB port on router so all devices can access this for your multiple printing needs. Tiny mention on the LAN is they are Gigabit LAN ports with neat indications on the router page for the devices connected on the LAN indicating which speed they are functioning. I have my Smart TV + Laptops on 5 GHz band and Mobile + Tablets on the 2.4 GHz Band and smart tv applications like remote control on tablets etc work with out any hassles. The smart tv outright detected my Iomega NAS drive which is DLNA compliant and movies and photos stream well. Heating is not an issue, the big vents have done the right job, only drawback is that Linksys routers does not sport a vertical stand. Finally this router won my expectations over Netgear DGND3700 (N600) and Asus N55-U (N600) which was in earlier consideration for my needs. The netgear was not quite stable on the ADSL connectivity side and Asus was too overloaded with 3 external antennas which was not in my preference list.

The range of this expensive gizmo is too horrible. I already own a Linksys E2000 router (bought in Canada), which has far better range compared to this X3500. Spending 10K+ for this device will not satisfy the needs of a user. Apart from the range issue everything else is very good. I completely agree with learnings of Fershid Raaj.

Reviewing it after a full day of usage. So this product is bloody good. I am using Airtel broadband and while on the earlier router the connection was good, as soon as I put this router to use it blew my mind. While the 5ghz band works like a charm the 2.4ghz band kills it with its range. I live in a 1500sq feet flat and despite the walls and he doors it covers the whole area. Brilliant buy.