My original review for this is retained below as some of the comments may be of interest since there are still likely to be relatively few devices which support the 802.11ac standard. However I have now got one the Linksys WUMC710 Wireless Universal Media Connector
so can comment on the future proof features. And the result is that I can now happily give the Netgear 6300 a 5 star rating. I connected it to the Linksys media centre without any difficulty, using the buttons on each device to do so. I then connected the media centre to a Humax PVR and copied a file from that over the network. I had previously got miserable speeds but this was blazingly fast at around 10mbps. The media centre is fairly close to the Netgear so range isn't an issue. The connection to all the other wireless devices from the Netgear is rock solid. I have now turned off the wireless on the BT Home Hub, connected that to the Netgear router and let the Netgear do the wireless broadcast. So this is a great product.
ORIGINAL REVIEW - LEFT FOR INFORMATION
This is an interesting product. It is at the cutting edge of wi-fi and one of the first on the market to use the new wi-fi standard of 802.11ac. This standard will enable transfers over wi-fi networks to be much quicker than they are now.
The first thing to observe is that this is "just" a router. It is now so commonplace for Internet Service Providers to supply a box which is actually a combined modem and router that there is probably an expectation that a box called a router would be one of those. It's not. If you want to be able to access the internet then you need to connect this to your modem. And if your current modem incorporates a router then you probably need to have a least some networking knowledge. Of course, because it is solely a router you could use it to build a local area network without bothering that it was not connected to the internet but I suspect that won't be what most people want it for.
The second point is that the new faster data transfer is dependent upon both the transmitting device (this router) and the receiving device (PC, Laptop, Phone etc) being 802.11ac enabled. Well the next generation of devices probably will have the 802.11ac capability but the current generation don't. (At the time of writing I gather there is one Asus laptop which does). So I can't comment on whether there is a speed increase.
Third, there is also supposed to be an increase in range of the signal but again that appears to be dependent upon using 802.11ac. This router is backwards compatible so it works perfectly well as an 802.11n (or g or b) device but the range it achieves using the "n" standard is almost exactly the same as my BT Home Hub v2.
It does have (once a firmware update was completed) a rather nice guest feature which allows you to very quickly set up access for guests without them having to login. Just remember to turn it off when the guests have gone if you don't want your neighbours using it!
It seems to work solidly enough as a 802.11n device but it is so far ahead of the device sector in using 802.11ac I honestly could not recommend it yet. Once there are devices using 802.11ac it can be properly tested (and I would expect the price to come down or this model to be superseded). Until then if you need a router I'd be inclined to go for a reliable well-reviewed 802.11n model.
Update:September 2012. The iPhone 5 was announced a few days ago. Apple are apparently supportive of the new 802.11ac standard so I half expected that they might include that in the latest device. They have not done so. It will support the alternative 5ghz band which is less crowded so there is a step forward, but it still leaves this router's capability some way ahead of the receiving devices.
Update October 2012. Apple has just announced iPad mini, IPad 4th generation and a new iMac. Interestingly none of them have the new 802.11ac standard. Apple seem to be going more down the alternative 5ghz band route. And just to be non Apple I also note that the Microsoft Surface tablet launched on 24th October 2012 also doesn't support 802.11ac. (I could not find this info on the Microsoft website so it relies on info from a third party reviewer).
So once again this router is still ahead of receiving devices.