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Fair. I'd not say I was well-read on the subject but what you're saying seems reasonable.
My approach is going to be trying to get my pair Decos to work as a wireless mesh network. If I still can't get adequate performance then I will bite the bullet and run ethernet cable between them. In that case, I'll only have paid £35 per wireless access point which seems decent enough value. But in the best case scenario I'll end up with decent wifi coverage without having to dig beneath my floors (because who knows what monsters lurk down there).
Reduce issues with handoff between access points when moving around the house?