To begin, note: - This is the TL-WR841N, so the antennas are detachable (unlike the TL-WR841ND twice as expensive); - This is the v9.0 model not compatible with DD-WRT (as I write this) but perfectly compatible with OpenWRT 14.07 I installed.
I use this router as a repeater with a WiFi hotspot which tended to be picky, I now have a very stable access: the router (with OpenWRT) is the perfect job for an unbeatable price.