First we ordered the "TP-Link TL-WR841ND Wireless Router (300Mbps, 4 Ethernet port, 2 detachable antennas)", which was not usable due to a totally unstable wireless communications. One room further with iPhone 5 / iPad3 were no app updates loaded videos hanged himself - 2 mins then happened just nothing - then "jumped" the WLAN again or veschwand simply times completely and 3G was suddenly on the iPhone / iPad see etc. Various settings and firmware update did not help.
So we bought the "NETGEAR N-150 / 100GRS RangeMax Wireless Router with integrated 4-port switch" for 22,30 directly from Amazon and this has been running for more than a month without any problems, has perfect reception anywhere, is much smaller, sees much better and precious, and is much better than the processed white TP-Link TL-WR841ND Plastikbomber.
So far, we are fully satisfied with the router.