in my head... iDevices = iPhone, iPad, iWatch, iMac... i.e Apple gear 🙂
And I can confirm they work much better (faster & ore "stable") on the 5GHz band.
My Macbook Air and iPhone7 both get 220mbps on my Vivid200 wifi connection (and 220 on ethernet of course). However, on wifi, they only get that when I put them onto the 5GHz network. Sat in the same spot if I then flick them over to the 2.4GHz network, they max out at 70-80mbps (others on here get even lower [<50] on their set ups) - it's just the limitations of the technology!
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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.