You get what you pay for.
My mate just told me he got the M5 4-pack yesterday and in his words - "it's absolutely brilliant". He is on the 100 package and wifi speed tests in all rooms including attic conversion and shed, get 100-108Mbps down and 10 up.
A 3-pack would probably have worked just as well and is £150.
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John
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My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.