" If i was to buy this............what would it actually do in terms of speeds etc?"
It won't work so it'll do nothing ;) Seriously though, you need an ADSL modem/router. The one you've linked to is just a cable router.
"I can only get 8 mb/s download in my area"
It's worth you checking what your BT "IP Profile" is. That dictates the maximum speed you're ever going to get. Have a read here on how to run the BT test and post your IP Profile results here when you've finished.
" Download speedachieved during the test was - 6.84 Mbps
For your connection, the acceptable range of speeds is 0.6 Mbps-7.15 Mbps.
Your DSL Connection Rate :8.13 Mbps(DOWN-STREAM), 0.45 Mbps(UP-STREAM)
IP Profile for your line is - 7.15 Mbps"
"Download speedachieved during the test was - 6.84 Mbps..........IP Profile for your line is - 7.15 Mbps"
You're getting the best possible download speed for your profile so a better router would be a waste of money as it can't make things run any faster.
There's no harm in also checking what speed BT Wholesale predict you should be receiving so click here, enter your phone number and postcode, then click the Search button. On the next screen, click on the "BT ADSL" and "BT FTTC" (fibre broadband) links to see what speeds you can expect from your location.
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